apply-figure-drawing-fundamentals

apply-figure-drawing-fundamentals is a skill for Claude Code from jeffreytse/grimoire-core. It costs 27 tokens per session (1,152 once invoked), scanned A, original, MIT.

A structured method for drawing human figures with believable proportions, body structure, and anatomy. It builds the figure from basic forms before adding detail.

In plain words
What is it for?
Use it to plan poses, construct bodies, improve character drawings, and create more anatomically believable figures.
Why use it?
It helps prevent incorrect proportions and body structures that are hard to fix after a drawing is finished.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the grimoire-art plugin — 18 skills shipped together

Good fit Use it to plan poses, construct bodies, improve character drawings, and create more anatomically believable figures.

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Install with agentmods
npx agentmods add skills/jeffreytse/grimoire-core/apply-figure-drawing-fundamentals
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add jeffreytse/grimoire-core --skill apply-figure-drawing-fundamentals
Clone the repo
git clone --depth 1 https://github.com/jeffreytse/grimoire-core

Made for: Claude Code.

Or install grimoire-art, the plugin that ships this one along with the rest of its 18 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

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README.md
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Your own site
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Per session 27 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,152 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00027 $0.01152
Opus 5 $0.00014 $0.00576
Sonnet 5 $0.00005 $0.00230
Haiku 4.5 $0.00003 $0.00115

Measured 11d ago against content hash ba9366d23d9e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

apply-figure-drawing-fundamentals scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/art/drawing/skills/apply-figure-drawing-fundamentals/SKILL.md · 54 lines

How it starts

The opening of the file, as written. The whole thing — 54 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Apply Figure Drawing Fundamentals

Build structurally accurate, proportionally sound human figures using a systematic construction method rooted in canonical anatomy.

Why This Is Best Practice

Adopted by: RISD, Pratt Institute, Art Center College of Design, and every major atelier worldwide; Loomis methods are standard prerequisites for character design programs at Disney, DreamWorks, and Pixar animation schools Impact: Artists who master constructive figure drawing reduce anatomical errors in finished character work by an estimated 50%; Bridgman's block-mass approach is the direct predecessor of modern 3D character rigging workflows that rely on the same mass-and-joint logic Why best: The human figure is the subject that viewers scrutinize most critically; systematic construction ensures proportional accuracy and anatomical plausibility that stylistic shorthand and pure gesture cannot guarantee

Sources: Andrew Loomis "Figure Drawing for All It's Worth" (1943); George Bridgman "Constructive Anatomy" (1920); Juliette Aristides "Classical Drawing Atelier" (2013)

Steps

  1. Establish the head-unit scale — draw the head shape first as an egg or sphere-plus-plane form; the adult figure is 7–7.5 heads tall (heroic proportions use 8); mark the total height and subdivide it before placing any other element.
  2. Place the keystone landmarks — mark the chin, pit of the neck, nipple line, navel, pubic symphysis, mid-thigh, knee, and ankle in their correct head-unit positions along the vertical axis.
  3. Block the major masses — use Bridgman's block method: torso as a box tilting on a ribcage-pelvis axis, head as a sphere, limbs as cylinders; render these as simplified solids before adding surface anatomy.
  4. Draw the spine curve — the S-curve of the spine connects the skull, thoracic cage, and pelvis; its curvature determines the character's weight, attitude, and center of balance.
  5. Set the shoulder and hip tilt relationship — when weight shifts to one leg, the hip on the weight-bearing side rises and the shoulder on the same side typically drops (counter-rotation); mark these tilts as angled lines before drawing arms or legs.
  6. Construct limbs as overlapping cylinders — upper arm, forearm, and hand are three distinct cylindrical forms that foreshorten independently; draw through each to show their three-dimensional rotation.
  7. Add major muscle groups as surface wrapping — lay the largest muscles (deltoid, pectorals, latissimus, quadriceps, gastrocnemius) over the structural scaffold as simplified convex shapes before adding secondary details.
  8. Check proportions with the plumb line — drop a vertical from the pit of the neck; in a balanced standing pose it should bisect the feet or the weight-bearing foot.
  9. Draw hands and feet from their own block masses — hand = a wedge-shaped palm block plus four finger cylinders plus a thumb cylinder; foot = a wedge with the ankle joint positioned above and behind the heel block.
  10. Refine edge quality to indicate form — use hard edges where forms turn away sharply (bone near surface), soft edges where forms round gradually (fleshy masses); edge variation communicates volume more efficiently than shading.

Read the full file on GitHub · 54 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 11d ago First seen · 54 lines · 27 tokens per session scan A ba9366d23d9e

Subscribe to this mod's changes

apply-figure-drawing-fundamentals is a skill published in the GitHub repository jeffreytse/grimoire-core (4 stars, last pushed 23d ago), licensed MIT. It adds 27 tokens to every session and 1,152 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.