I've noticed a lack of quality in pictures of feet, so I'll put in my two cents on how to do it properly!
There are some basic things to keep in mind when taking pictures of feet, such as lighting and background.
Shed Light On The Subject
This should go without saying, but make sure there is good lighting in the picture, or at least compensate for it digitally.
Make sure the background of your photo is easily separated from the subject and clear of any embarrassing items.
Posing And Composition
Even though your picture is well arranged, it still needs something...oh yeah, feet!
A Different Angle
One of the first things I've noticed is that feet look completely different from different sides. For example, if you look at it from the inner (bigger) side, the big toe and "balls" of the foot appear larger, while the other toes look smaller. However, when looked at from the outer (smaller) side, the big toe appears smaller, evening out the size of the toes and all around making it more attractive.
Less Is More
Though it may seem counter-intuitive, you should try having the model wear pants that cover up the ankle and most of the heel. The ankle is generally unattractive, and this also leaves something to the imagination.
Try these posing tips to really help make the shot.
Having both feet parallel one another makes for a visually uninteresting picture. Try having one foot on top of the other to mix it up.
Scrunching Is Cute
Curling the toes almost adds a feeling of innocence to the picture, and, when mixed with the previous tip, it can really sell it.
While adding accessories to the feet can spice it up, some things just have the opposite effect.
Nail polish is kind of hit-or-miss. If used sparingly, it can make for a better shot; if you totally cover your nails in red, you run the risk of ruining the picture.
Wrapping bandage around the arch area or ankles can break up the long space of the soles or tops of the feet.
Some people like them, some don't. Experiment and see what works best.
Could fall into the "Wrappings" category, though they work better around the ankles.
While they conceal details like toes, socks work well for some shots.
Bondage almost always works for foot pictures.
Some simple writing or scribbles on the soles can tell a whole story.
Leaving some feathers or pens around can give the impression that a tickling session is present. If you're patient and clever enough, you can even pose the tools in such a way that makes them appear to have minds of their own.