Cool! I like the effects on the sides it looks like springs and whatnot you might see in a robot.
This is pretty good however i think you could have gone with a smaller canvas. You have a lot of negative space in the sides, and it gives it sort of an empty feeling.

The effects are nice but the first thing i noticed is Ironman is VERY oversharpened. ANd everything else is blurred a lot. I think you should tone down the sharpeneing and then unblur some of the effects. The trick is to sharpen iron man and a few bits of the effects, leave most of them the same and the blur a couple. That way it's even in depth.

I think you need a bit more help on the blending. It seems you smudged him around a lot, but you only smudged a little bit and erased everything but that small bit. Normally this wouldn't be a problem but the transition for black to smaudged around ironman is not very smooth and in turn doesn't blend very well with the sig. I think you should smooth out the darkness to smudge.

The text is a bit big. And I think you could have done without the clipping mask. The clipping masks make sit so that a bit of the text is really bright and a bit is almost too dark ot see, it's pretty jumbled. I think i would like the solid text better.

I think you need a lightsource, this seems pretty dark and i think it would liven up the background a bit.
LAst but not least, coloring! I think you should use a few more gradient maps or soemthing. The effects are all different and wild colors, red, yellow, puprle, blue, brown. It's too much. You should make it go with ironman a bit more using photofilters color balances and gradient maps.

ALso, where'd you get that render? It's sweet.

I like the sig though, it just needs some touchups.