5-7 px? thats pretty thick. Kinda depends though i guess. As long as your talking about around the WHOLE sig then yeah 5-7 px is okay but, I'd probably go more with 3-5 px.
It looks like there is somethign on top of master chief. Like another render on a low opactiy. I'd get rid of that it makes it look too busy and hard do look at. I'd also try moving master cheif into the middle more if you can. He's pretty far off to the side, which kind of makes him look less like a focal point.
I would try adding something to the BG. Maybe a c4d some brushing or something. What I'd do with this sig is probably add a c4d on linear dodge blending options. Brush with some cloud brushes on a new layer, and smudge them using a 36 px chalk brush on scattered smudge settings like these:
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