Sweet. It looks like they're wearing waxy coveralls, what paints did you use? My favourite part is probably the stump with tuft, I'm weird like that.
As its for a competition, forgive me I know you are down, the only tiny thing I would add is paint in the barrel of the gun, and the side of the base with a dark muddy brown. Good luck with the comp! I think if you keep at it you could get some awards and network a bit.