Drawing tutorials - Foot/Feet Reference by karla. I find feet the hardest thing, especially foreshortened.
This goes to an ad for orthotics but the anatomy lesson is a good one. There are 26 bones in the human foot which are grouped into 7 tarsals, 5 metatarsals and 14 phalanges, for a total of 33 joints, of which 20 are actively articulated
foot and ankle anatomy for artists
Complex structures of the Human Foot. Don't ignore foot pain - see a Physio. (Psoas Release New Years)