Scaling the carbon pattern has caused loss in quality. Also, the gradation of the buttons is not in sync with the other parts I think. Other than that, the foliage growth and other grungy elements are awesome
The effects are A+, but not so sure if the "grudge", textured style fits. I would suggest making glass styled effect (with blur) for the navigation instead of what you have there now. Also, the image of you might look better with clean borders, but maybe that's just me. Also a little note; the pattern below the 'Iron man' icon is not in the perspective. Not noticeable at the first look maybe, but when you notice it, it can bother. That should be easily fixed though. Overall quite nice design.
Looks amazing. Great job. The only thing I would suggest is to work more on the lightning. I know sometimes is easier to duplicate an object, but giving more time to details is worth it. For example, in the header where the logo is, you have the light coming from the top, but on the 4 nails, the light is the same even though they are not in the same position. The same with the two lights from the footer area, where the platform is. The pattern with the wholes doesn’t seem right. The lightning should be reversed and the wholes from the back with the one from the front are the same size. You should make the ones from the back a little smaller, so you can give better the impression of depth. Just my 2 cents J