Just a common trend I see with your shading. I don't know if its just a stylistic choice but the human body is composed of mostly round organic forms. The core shadows your employ are often quite harsh and read as hard edges. Other than that I can't draw hands much better than you can so keep up the grind:)

Hi @Nicole Lee , nice drawing! I like the gesture and the drawing seems very accurate compared to the reference.   SHADING The shading doesn't feel just right to me. This lighting situation is tricky, since the bounce light is very strong. The shadows are filled with a lighter tone, which makes it hard to discern what´s shadow and what´s not. In the thumb it looks like you interpreted the bounce light as the main light source, making the thumb really light toward the right, and darker to the left. In the reference it's the opposite.   A similar thing happened in the ring finger. You indicated the dorsal side to be in light, when I think it's actually in shadow, considering the light direction. So the core shadow would be higher up, in the transition from radial to dorsal side. To figure stuff like this out, it helps to be clear about the light direction and light rays.   In the anatomy course Stan has a very cool style of rendering; mapping the shadows out with clear core shadow. I´ve found that in some poses, it´s really hard to identify the core shadows. When encountering poses with light even more tricky then this photo, I have to drop the core shadow thinking, and just focus on value shapes.   STRUCTURE   In your drawing the hands feels a little soft. I think it would be helpful to introduce more straights in the bony areas to get that solidity. Also, pay close attention to how the wrinkles between the phalanges wrap around a cylindrical form.   I hope this helps :)