first isnt to bad, just a few tweeks like burn tooling the deep shades in bg then adding some type of partical effect in the center of the swirl accordingly, second tags has to much topaz thus causing no flow or depth..
I agree with Xed, there pretty cool ideas and they have a good feel to them. 1.) The center like Xed said could use some more a effects to it, but keep it circular. The cloudy idea is nice to but once again like Xed said maybe darken them a little and possibly sharpen? Also I personally don't like were the text is placed or the font you used =\ 2.) Xed pretty much nailed it IMO there isn't anything I can say about it other than that. 3.) The lighting source is really bright, maybe try fading the brightness as it goes out? Also on this one the render seems a little sharp. post some V2's I'd like to see if you change anything <3
Hitting ever post i've seen today, now why can't most members here be so supportive good work on all three! first one is a cool idea if you could throw a little more in there like all have said.. i dont want to sound repetitive but i like the first one's idea and the glow around optimus kinda makes him pop out a bit if thats what you were going for, i myself have been trying to work with depth in the past, its a hard thing to control while working with graphics. keep up the work and practice makes perfect, its true.