@7heSama: I agree, now that I look at it the little box/vent on his waist shouldn't be receiving that much light, it sticks out too much. I'll do a quick edit and see if I can fix up that and the arm. Thanks for the helpful C&C :)
The detail on each piece of the body is what I like the most. Dithering the background smoke is a clever choice as well. Great piece 
I think this is fantastic, I'm not too fond of the style of dithering used for the cloud/smoke but the use of pallete and the composition is great.
Looks freaking amazing. I think the composure is really good - the shadows in the smoke look amazing and it's just simple dithering - and the details on the bot are awesome.
One complaint is that the heavily shadowed left (our left) leg/arm don't exactly seem to blend well with the rest of it. THe change is really sudden. I think the really heavy concentration of blue on that little blocky thing on his waist hurts in that regard, too.
Still love it.
No problem, it looks better now ^-^