Alien Invasion! A Photoshop Tutorial..

tutoral which shows you how to get from this

http://www.imarc.net/examples/aliens/1.jpg

to this

http://www.imarc.net/examples/aliens/final.jpg

linky here (http://www.imarc.net/blog/85/ahhhhh_oy_alien_invasion_a_photoshop_tutorial/)