Muscles are color-coded (often using cool greens and blues) to help artists distinguish overlapping muscle groups during dynamic movements. Block-outs:

: Sculpt muscles as interlocking puzzle pieces, never isolated tubes.

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Uses a "skin-to-bone" approach with side-by-side comparisons of skin, color-coded muscles, and 1st and 2nd-level block-outs. Beyond the Arm:

Glides fluidly across the ribcage. When the arm raises overhead, the scapula rotates upward, drastically changing the silhouette of the back and upper shoulder. The Upper Arm (Humerus)