maybe the hands arent the only thing, the pose is pretty flat so the arms read odd too. one thing that helped me is blocking the hand as a simple mitten shape first, palm box plus one wedge for fingers, then check it against the chin size before adding fingers.
the mitten trick is good, though for me the wrist is doing more damage than the fingers. it just runs straight into the arm. maybe give the forearm a small taper and let the hand angle off it a bit instead of lining up. the tie hand could also overlap more