Those are really cool, I like the Apocalyptic Companions and the Corvus Aviator.
I remember seeing the second one on DA, still love the shading and facial structure.
Here's a sketchdump I uploaded to deviantart ages ago:
The Scrabania piece at the bottom is actually finished now, but the one with the partially-coloured Slig and outlined Mudokon wil probably never see the light of day.