It needs massive amounts of work. The feet and hands are stretched out cones, the torso is too wide, the arms and legs are too cylindrical, theres no muscle definition in them, the crotch isn't defined, the proportions aren't correct to the human anatomy, and you should never start with a sphere to model a human head, a box divided 3 times vertically, and 2 on the other axis' is a good starting point. Theres also the issue of there not seeming to be continuous, flowing edge loops, although a wireframe would help to see this problem.
Post a wireframe and we might be able to do a drawover of how your mesh could be tweaked to look better.
Good attempt at a first human, but Id consider starting over with what you've learnt, and looking into tutorials.