The drawing dosen't seem very level. His left eye is too low, as well as his left shoulder strap. The stitch lines on his overalls seem a tad arbitrarily placed. You might want to study some real-life round objects to get a feel for how the curves work. I happen to have a large, flourescently coloured plastic egg leftover from easter sitting on my desk, but you might not be so fortunate. A real egg, perhaps? Also, the brim of the hat seems to be hugging his forhead for some reason.
I'm not quite sure how to explain reflections, so I won't go farther than to say that the recently added (light blue) highlight isn't where it should be, and strangely shaped.