After seeing this, I imagined my self in the cockpit of a GM, while this thing stands intimidatingly on top of a pile of destroyed GMs and staring back at me...I must say this thing strikes fear in a persons heart! Amazing build, I love the shape and the weapons(tough I see you used the schyte of Mithryl Dlarix or at least a similiar design. But sadly there's one huge problem with it...there is no way this would stand if built for real, you'd need to glue the whole thing together. My only complaint would be that it's too dark and can't see much of the detail from a distance. Still, this is epic, well done!
You've got real talent and originality (Which is far more rare than you'd think). My only suggestion is include more action poses, I know it's a pain in the erm yeh... But it really sells, because to be truthful, people really like two things: flashy colors, and interesting photos. Even on mocs of low quality, this can be seen. But looks like you've got a great style here, so keep it up.