Dude, that look bad ass, and I hope you take thsi as a complimment, looks cooler with the helmet off, the Mk7/8 helmet is cool, but I always liked a groff looking marine with his helmet off in the armor and you fit the bill. Awesome build!
Also...
Try not to take offense at the lack of fast responses sometimes on this board, there are tens of thousands of members and sometimes a post gets bumped nine pages back in like 10 hours, and you are posting along with what I consisder to be the most talented people on earth on the RPF, your work is fantastic but Warhammer 40k is a niche thing that many are not familiar with, so some people may now even know what you've built, I do and it's frigging awesome