oh hell yeah, these look awesome!
re: drawing shoes, this is something a lot of artists don't pay attention to, and me neither. i instead like to draw two spheres, one longer one shorter, forming the shape of a foot, then round out the contact pointsto make it look more natural. and then i put like a cylindrical mass tucking the bottom in, like shoe soles. and then i just mess with the shape until it looks good idk art is a lot of messing around for me. but approximating the geometrical shape of the foot helps you draw it in different angles more effectively.