When the hand grips an object, the "fleshy" parts (the thenar eminence at the thumb and the hypothenar eminence at the pinky) compress and bulge. Always look for these points of compression to show weight and effort. 4. Tension vs. Relaxation
Look for the "S-curves" that flow from the shoulder down through the fingertips.
The bony bump on the pinky side of the wrist. Note that this stays stationary while the radius (thumb side) rotates around it. 2. Pronation and Supination: The Great Twist
The curve from the wrist to the fingertips.
This is the most common mistake in arm sculpting. When the hand rotates, the two bones of the forearm (the radius and the ulna) actually cross each other.