How long can he stay in camoflauge, what can he do while in it. Seeing as he has a gun and his weapons and still has armor he will need some sort of draw ack or weakness in this form or in general. Along with that can his weapons turn invisible.
On the issue of that weakness I noticed that in form two he has no eyes, so is he completely reliant on scent to target his enemies? If so that would be enough of a weakness.