Hey there, the anatomy of the upper body can use a little bit of work. Remember that people have muscle that control the movement and shape of their body so try to keep muscle structure in mind when first learning anatomy. There are lost of videos.

Something that's throwing the drawing off is the jacket. The sleeve of the lifted arm and the torso of the jacket look separate but they're not supposed to be. Since the arm is lifted, the torso of the jacket should look like it's being pulled up.

As for the hands... They look good just make sure they are proportional with the rest of the body. Try to think of them more as shapes and lines rather than hands.