His armor shit looks kinda grey, how do i fix that?

If you read tutorials, you would know dude.

select his body

now color balance

Jenova. Getting tired of that yet?

Jenova speaks the truth. But I guess a color balance would work fine to.

The way most of us get to blend everything is through multiple gradient map/curves/other adjustment layers throughout the process of making the signature.
If you saw the .psd of one of my signatures there are usually 2-3 near the beginning of the sig, maybe 2-3 around the middle, and 2-3 around the end.

i would brush over the body, where it should get some color.
then set on soft light. and erase parts, that doesnt looks well

I used to do that but I'm getting away from it,trying not to use gradient maps/photo filters too much etc, it ruins the colors in a sig imo.

I can tell from looking at your sig

Yeah the colors are more vibrant than they would be if I had added tons of gradient maps and photofilters.

Ah, but it's just that it doesn't blend in naturally with the environment of your signature.
You must not be using them right, hmm.
Either you're using the preset ones or using them near full opacity, not mixing them well, hmm.
I tend to pick colors from my signature, bright ones sometimes.. setting them at low enough opacities, and such.