what I noticed is that while the right arm is moving, the left where he holds the coffee doesn't, which seems very counterintuitive to me, even if it's ever-so-slightly (a very slight back-and-forth). and yeah, the torso might turn to the side a wee little bit as well to get a more dynamic movement.
what I find a bit difficult/confusing is to distinguish between the shadow and the right limbs as they are the exact same shade. maybe fixing this (like making the right side lighter than the pure shadow) can help to tackle the problem better.