Well, usually I draw them in poses where the feet wouldn't show in the panel... that's mostly it. It's not often I get to draw fullbody character shots, and usually they're shown from the head and down... not giving much room to draw the feet.
It's not just getting the feet themselves right, it's also the shape of the shoe... Bare feet (or even just in socks) are a whole other chapter, good thing my characters wear shoes.