First off great job coloring in the whole piece, its an easy mistake to just leave the page blank and reob yourself of that valubale valubale information. I think you nailed it yourself when you mentioned the toes, i feel their the single biggest detractor form this studies over all success. I noticed you really emphasised your contour and it "flattens" your image (I do this ALL the time too bad habbit). If you lighten up your contour I think it will give you more freedom to position the toes correctly on the foot, that way the top of the toe wont be faceing a weird direction in reationship to the top of the foot. Feet are basically a wedge so try to keep that top fairly alighned. I think this is a really good study and practicing will definitley pay off.
Wow these are allreally great, the wrinkles are a detail I'm always too lazy to add in. I think the biggest step you could take to improve your hands is to shade them. Shading is essentially the "free realestate" of form. Your gesture is really good but for example in the third image the "ok" hand has a squished index finger becasue its pointed towards us in space, so if you had shaded it instead of makeing the shiluhette do ALL the work it would have ""reached" foreward more. I hope you get into animation school!
