Why yes, it does look infected..... jk.... I don't like the background/colors of it. Too much smudge action going on.
I like the dirty effect you gave it, you do a really good job on that effect. Yeah the bike itself is kinda placed weird. The text can be slightly smaller. Nice job overall.
Uh.... This style worked for the skate board sig... but not this. It took a few seconds to get what the stock was......o.o You should try and place your stocks so that someone who's never seen it before knows what it is. You need to work on text more; make sure the font is smaller and maybe add a clipping mask on it. Flow is a good tool to use in your sigs, don't ask me why though, for I was probed by aliens and I lost the knowludge. Depth, another great tool in tag making. To achieve depth, use the sharpen tool, blur tool, dodge tool, and the burn tool. Sharpen up the foreground, blur parts, or sometimes all, of the background. Use the burn tool in places that light would not be hitting, and dodge places light would be hitting. Lighting is good too, and that should be an easy concept aswell. I would say look up a few tutorials for making any other tags.