Not too shabby.
I'd replace the sling on the rifle with.. some other material (can't think of what you're supposed to use). I did the same thing you did and it just doesn't hang naturally. Some of the other guys here have more experience than I.
Parts wise it works, whats it look like without the neck scarf? Maybe use a small piece of actual fabric instead?
Pouches etc look good, maybe paint the vest? Not totally needed but would make it "pop" more probably!