Deserves much more than a 6.6 imo.
The rust and dirt parts look very nice, as does the oxidiation of the metal parts on the melee weapon. The fronts of the bolters look a bit boring compared to the rest, though. I could rate you better if I could see the bolter side, too. The freehand on the leg is a really nice touch. Keep it up, it's a good 8 for me.
Noc