i love the bender render but then all true geeks love the tv show he comes from I love how you have done the text and the brush you have used to blend the renders is kewl. just not sure on all the dots is all. Spose the only other thing is you could do some hue/sat adj or use a brush based filtre or somesuch to darken the bender render to the same as the other three.

All in all I love it!