Hmm, looks like the left arm (closest to the front of the page) is broken. The point of the 'elbow' is unnatural. I understand you want to put emphasis on the weapon he is holding in that hand (very creative, by the way). try pulling the arm back, almost in a running position, and that would leave room for the weapon. Or, you could even hold it in a different position. The right hand (the one in the back) is great! But the wrist's position is slightly off, and it looks uncomfortable for him to be holding. Try straightening out his arm, but also be sure to add the elbow, so the arm wont look like a noodle ^,^. Also, here's a tip. Try looking at your own arm in the mirror, in your character's position. try mimicking that. I know it's hard, but it works : )
The eye is directly under his hairline (aka forehead.) and it is quite the distance away from the nose. Try lowering the eye, but also keep in mind the proportions. Large eyes, Larger head, medium mouth, and so on. I hope I'm not blabbing too much >_< But I'll post up some of my stuff, and you can feel free to learn from them. But I am not as courageous with bodies >_< so I tend to leave them out. I also draw the anime/manga style, so most of my works are from the torso and up. But sometimes I get risky and draw the full body. :)
Anyways, I hope to hear from you! Keep working hard! YOU WILL GET BETTER!