Tactical Marine from wh40k universe. The Marines are enhanced humans, who have more strenght and vitality than normal people, and who are driven by furious hatred to everything that is considered an enemy to their beloved Emperor. Wearing power armours, with powerful and varied weapons, Tactical Marines are workhorses ok Space Marines' forces.
I like it alot, but as some of the others have said, the helmet is off. I sugest using a storm trooper, or clone troopers helmet from the star wars collection. Also, can you show a picture with a regular lego guy next to your marine, so we can get some idea of scale. And then do the same with the dreadnaught