what do I mean, by 'overcontrasted', or 'interesting effects'? I'll explain em both, to save a post.
OVERCONTRASTED: for ex. In your Halo sig, where the lightning, and areas on MC, are lighter than the surrounding areas, but too much contrast makes its omfgbright and pixelated/too sharp. Basically, when your colors/light areas get too bright/washed out.

INTERESTING EFFECTS: mainly, I was talking abouot the areas immediately above and below the gun. It looks like theres some dusty/smudgy stuff coming off. Also, a couple areas of the BG might show out a bit more, with some touchups.

Please dont get upset if you knew what overcontrasted meant. It sounded like you didnt know, thats why I explained.