it's nice to see your works capturing the overall structure of feet & hands, and by my standard they're done in a good way. Your lines are fluid and confident, the structures are convincing and relatively easy to understand. Something I want to recommend to you is try doing both digital and traditional practice and more gesture drawings, it's only a suggestive opinion, but from my experiences this will help you to have a better control when doing figure drawings.
As someone already pointed out, there still exists minor problems in proportion and tiny structures, but I'm currently having trouble with that as well, so better listen to someone else than me.
Anyway, Good job and keep up.