I think it looks good so far
. The problems I see is that the suit is very flowing, when looking at this ref you'll see it's more segmented, the shoulder, upper legs, lower legs etc. I think if you could seperate parts more it would be a step in the right direction. Right now his arms are very undetailed, there is no forearm guards. Plus the knee plates are too defined over the upper legs.
edit: you could also buff up the upper legs more, the thick metal armour pieces are so characteristic in starcraft and warhammer marines.
