The plate carrier looks a little bit crowded and heavy but that's really just a personal preference thing I guess. I'd replace those black pouches with some khaki ones though. Same goes for the black belt and dump pouch.
I've always liked P90s and yours is no exception.
The stubby looks more like a JG to me, rather than a King Arms. The pin to butt distance isn't all fucked up and it doesn't have any trades or markings on the receiver. Change out both grips and move your optic further back/replace with an Aimpoint and it'll be great. Paint isn't needed.
Also, I don't recall Prometheus making 6.01 barrels. It's more than likely a 6.03 if it is Prometheus. If it is a 6.01, sell it and pick up something in the 6.03-6.05 range. I also prefer all of my shit to be rear-wired so I don't have to keep my battery in a PEQ box (I'd rather use a bag on the stock if I have to), but stick with whatever you find to work best.
The combat machine looks nice, just get that warning sticker and the broken orange tip off of there.
Did it come with the black carry handle? It looks... out of place.
The SCAR's paintjob is a little crazy but I wouldn't go so far as to call it ugly. The black tape and PEQ look out of place, along with the sling attachment. I'm not a fan of AFGs, and it took me a couple of minutes to notice it and that it wasn't painted, but that's personal preference I guess.