A simplified model of a hand.
Anatomy of the hand: the bones.
On the inside of the hand, you can see the thumb muscle, the pink muscle and the fatty cushion below the fingers. You can use these as a atart to model the hand.
The knuckles are the joints of the bones, and they curve.
The tendons are visible on the back of the hand.
Knuckle positions relative to fat cushions.
Draw from observation, then from memory, a few well-drawn hands by artists you admire.
Draw your hand from observation, then from memory, trying to apply the simplifications and idealizations your favorite artists used.