here is a showcase of my favorites from Wtf's art gallery:
this one I found totally great. Loved the uniqueness in design:
http://newpie.deviantart.com/art/The-Bird-Who-knows-Who-89686184
I love the design on this one. Such personality!
http://newpie.deviantart.com/art/Grim-Reaper-101070701
other than the slightly weird highlights, I found this captured it perfectly:
http://newpie.deviantart.com/art/Killzone-117300870