Wow, I need to post here more often >.>
Motsuko: You misspelled "guardian" :x -shot'd- It's looking a tad-bit monotone, actually. Well, it would look more monotone if it weren't for the render's eyes. But whatever. Er, the effects look good, but it gets distracting closer towards the face. I don't know whether there's any effects there, but it looks fuzzy, sort of, and it ruins it. There's some depth in there, with the blurry bit to the right side of the banner, but the sharpness of the text contrasts too much with the softer effects, so the text stands out more than it should. Text placement would have been great if it wasn't for that.
Gerri: Wow! That was made from scratch? :O Amazing 3D work, dude. Though the smaller one looks better than the full size, as the large version is a little bit choppy at places, and the sizing down made it look smoother. Anyway, I think it looks very much real. Besides the text and all that stuff. Oh, and I thought that the slide-y unlock-y thing at the bottom was longer than that o.o And at the top, I thought it would need more lighting at the speaker/ear-piece bit, since it's looking too dull (well, I'm comparing it side-by-side with an actual iPhone picture, so...). But it really does look wonderful. It almost makes me want to print it out, stick it on a box of some sort, and pretend I have an iPhone... -shot'd-
Ionic: I can't say I'm a fan of the 'split background' thing that you did. Sorry, but the bright orange simply hurts my eyes. If you're going to colourise the background, I think you should either colour the whole thing, instead of just half. Unless the concept behind the banner suits the whole half/half thing. The effects need to be cleaned up a bit as well. There's far too many starry effects, and the C4Ds take the attention away from the render. The grid thing towards the bottom right looks pretty... distracting, I guess. And I don't like the boxes around the text. Just work on cleaning up effects, try not to put too much on the canvas.