Eep. Not too hot.
Well, the huge problem is that he's ridiculously out of proportion. His proportions seem to get smaller and smaller as you go down, and it's really very unappealing to the eye. Some advice, dear: Learn how to draw realistically before you attempt a stylized picture, especially is you don't have a great hold on anatomy. Also, sketch out the figure (I.E., a stick-like man based on a model) in proportion before you fill it out, give it clothes, etc.
Also, people's heads don't grow out of their necks like that. o.o;; 'Nuff said. You have a jawbone, and your neck is not always directly under your head, *especially* on a 3/4 turn pose.
It also doesn't look right that from his hairline down to his chin is a virtually straight line. *Especially* on a 3/4 turn, a person's face has a lot of contours that need to be taken into consdieration. Do.
Lastly, hand, love. Awful hands. Now, personally, I've never found hands *that* difficult to do (meanwhile, the rest of the world is like, ZOMG DA HANDZZZ OHE NOES!!!11eleven). But, they do take time and consideration, not five lines thrown together however you feel. First off all, your arm not not just suddenly decide to branch out into five fingers. There is this mystical point called the wrist, at which your arm narrows before widening again and becoming your palm. Please, don't omit the wrist. It always is awful without him. Secondly, keep in mind that your thumb in not on par with the other fingers. Not only is it much lower, it faces a different direction and bends differently. A thumb can make or break a hand.
The simplest way to start drawing hands that are not eyesores is to first draw out all of the major parts of the hand (IE, circle for palm, the three joints in each finger, and the two in the thumb) first. Then, you'll see how the can bend and if they're all relatively the correct size or not. A sketch of the inner workings of the hand can probably be googles, as well as anatom tutorials.
Oh! Also, clothes. Contours in clothes do not just form where they feel like it. They form based on the way that a person is positioned. IE, if your person is turning his torso to the right but his ankles are still, there won't be folding in his socks, which is just about what you've worked yourself into here. You seem to have put wrinkles in just because you thought they looked pretty. You're a little wrinkle-happy. Tone is down, and put them where they would *logically* be (mystical word, isn't it? Logic...). Also keep in mind that where there is wrinnkle, there is strech somewhere else.
So, keep trying, I s'pose, but for now, keep your day job, hun.