Nice, very nice. My only criticism about that one is the line around the edge of the Star Destroyer. I know, you were going for a hand drawn and outlined (inked) look. However, with the way the line is saw toothed like that, it looks more like cut and paste.
My own fault, resized then did some more work on it and didnt realise I had destroyed the outline (caused initial by the alpha problem from rendering, secondly by just being stupid and not maintaining my normal workflow :P).
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Thanks for the feedback
Please continue playing with Iray. I like how this is looking!
Further experimenting, this is more photoshop than iray, going for a comic style
Great work, as usual.