Haha, nice work. The only big initial complaint I have is the jpg quality. Flash does a real shoddy job of exporting gifs and jpgs... for the future I would recommend exporting as a png and saving as a gif/jpg via photoshop, or if you don't have that, GIMP.
I like the way the cigarette rests in his mouth as he screams. The grenade looks pretty good, i like his fingers as well. The hand holding the gun looks a bit funny, maybe because he's missing an arm. The outline on the gun is also thicker than the rest of the drawing. The text on the bottle is a little hard to read. The camo top was interesting, gave it more of a military feel.. perhaps you could have used more colors of green instead of two, but it still looks alright. The fire in his eyes shows his true anger, but something about it just feels a little wrong... maybe it's the blue background they are on. Some nice work, I doubt you're going to continue to contribute to this thread, since the topic is about one work in specific, which is kinda sad. Nice work :)