Finally, the foot !
Let me tell you one thing beforehand:
>> Nobody ever looks on the feet.
Just in case you still want to draw feet, let's go on:
The entire body rests on the two ends of your legs, more precisely, the ankle. From there on downwards, the weight is divided to the heel and the rest of the foot.
The ankle is the joint on which the food rotates and although it's quite flexible, it doesnt really move that much. Try it out yourself, how far in each direction can you actually move your foot ?
The upper left diagrams show bones and tendons etc.
The first one is too short though, the second one is better.
Remember that the foot is an arch, horizontally and vertically, check the figures in the middle.
According to Bridgman, the toes are not all the same when drawn roughly. The pinky (1) and the big toe (3) step downwards in lesser steps than the others.