There really isn't much for me to say except that you should always remember this:
No matter what you're drawing--be it face, hand or foot--keep in mind that everything comes from some sort of basic shape. An egg shape would make the head, cylinders for arms/legs/fingers, circles for joints--such as knees and elbows... Things like that.
Also, practice!! Practice, practice, practice! If you make a mistake, work through it. Keep pencilling until you can get it down right. Speaking of pencils, be sure you draw very light, otherwise it'll be a b*tch to erase when it comes to be inking time. I'm not the greatest artist but, I hope that I helped in some small way. If you ever have any questions, or wanna just talk about art or anime, PM me.