Okay, I actually like Dinobot as well as figuring he'll sell. Generally I find him most interesting when he's playing Rattrap's unwilling straight-man, but that doesn't make for much of a pin-up, does it?
Pencilled, inked, scanned, coloured in Photoshop. Background is mostly 'shop.
It looks like he's smirking here. In the full-size version ( not posted ) you'd see it's actually a sneer.