With the bulging I would suggest leaving the outline alone and rotating the shading only, what you did helped but its much less interesting now. I also see what you mean with the face shading, I just tried it, did not end well. Maybe at least a shadow above the eyes (and fix up the shadow on the top of the head, unless you intend for all characters to have hair), and round out the chin a little more. There's some banding on the wrists when they're extended fully towards us. Another thing I noticed was that the ears stick out more in the front view than in the side view.
Definitely agree with Jigsaw on the arms.