The toes on the first shaded drawing look too short (they look more correct on the simple construction drawing) and on the third drawing they're too long. Also, the toes on the third drawing look very flat, you should be able to see some of the front plane from that angle, try drawing the toes as simple boxes so you get the perspective right, kinda like you did on the first one. Maybe try making your drawing bigger so you can fit more detail and describe the form better. In general, I think you need to go back and practice perspective more before you do all this anatomy stuff. Drawabox.com is very good for that.