Hi there! Looking great! You have a good understanding of the overall anatomy, and I like the use of different colors to differentiate between the aspects of the hand.
I think that using a lighter stroke of the pencil when sketching the hand and really focusing on the different parts of the hand could help. Fingers are relatively stiff so make sure you give them plenty of room when coming into contact with the other hand. The thumb also sticks out just a little more; I like to draw mine coming of the box of the palm like a triangle, long side pointing towards the wrist.
I think that using a lighter stroke of the pencil when sketching the hand and really focusing on the different parts of the hand could help. Fingers are relatively stiff so make sure you give them plenty of room when coming into contact with the other hand. The thumb also sticks out just a little more; I like to draw mine coming of the box of the palm like a triangle, long side pointing towards the wrist.
Good job and have a blessed day!