well the shape itself doesnt look too bad, you might want to put another edgeloop in the feet so that you can give them a little more volume in the middle, and either your vertices in the center of the model are not merged, or one side has its normals flipped. other than that the sillouhette is not bad. one thing tho is that you need to make sure joints are set up correctly to be animated right and the way to do that is to make it so when they bend they are neigther jagged or or have a loss of volume. there are a lot ideas, but it's very difficult to do correctly and some people devote there entire job to rigging models. If you want a tutorial on the most simple and effective then here is a small tutorial made by ben mathis. its pretty useful:
