I use GIMP and these are my best I think so far.
The only way I'll get better is by any C&C so don't hold back.:D
http://i452.photobucket.com/albums/q...88/Ironman.png
http://i452.photobucket.com/albums/q...Bioshock-1.png
http://i452.photobucket.com/albums/q...88/Robot-1.png
http://i452.photobucket.com/albums/q...A88/Keaton.png
Remember C&C is always welcome....cheers!
