1. Um. It's a bit LQ, actually. I think the original would've been great, but it seems t have gotten to an extremely low quality point sometime. I can hardly read the text. Otherwise, I can't say much. I'm not a big fan of the reds you used, and probably would've used a different colour, but it's okay. It worked alright here. ^^;
2. Herpderp. I like it, except for the blurring on the right side. It looks a little too blurred to me, but eh.
3. Despite not really being a signature and more of a banner. (I have no idea how to explain it. You just didn't use any art rules and slapped things onto one other. More like... banner/advertisement design, than signature design. That probably doesn't make much sense) It actually looks quite nice. I like what you did with the text. It's lovely. At least the Music one is fabulous. I'm not sure how I feel about the text below it. The Bokeh and music symbol in the Background works nicely. It adds a touch, but it doesn't overpower the eyes, and isn't a vocal point. Very nice. I really do enjoy that Quiggle as well. The only last thing I can say about this is you probably could've done a bit of a colouring job or something of the like to bring it all together. The way, I look at it, even a very low gradient map or adjustment layer is like a fine cover. It doesn't appear to do much when you apply it,but what it does, imho, is brings things together. Ties them together, in a sort of way. That probably didn't make aany sense,but meh.
4. Huh. Let's see here. The border doesn't work. I would've done like a 3 pixel bar on the top and bottom, but that's just me. It's a bit too monochrome. And there's conflicting focal points. On one hand, we have the leg, and his guitar, on the other, we have his head on the far left side. That's really conflicting. The text is, meh. I'd have gone with something else, personally. I'm not quire sure what else, but that font (well both fonts) don't exactly work nicely. Sorry. You do have a nice little blur thing going on, I must add~
5. Yup. This is beautiful. I don't have much to say, sadly. Except the C4D's, I personally would've put them at a different angle,but that's just me. I'm assuming those are wireframes type deals on the sides? Yea. Those. I like those. They work well. ^^ And love the pink. It just works here. Lovely job. :3
6. I like your C4D work, and stuffs. But, your focal seems to be buried in them. Expose her a little more would've been better, imho. As great as C4D's are, you don't want to overpower your focal person. or your stock. And, I'm sorry, that's whats happened here. I'm not quire sure whether I like the B&W thing you have going, or not. Hm. A bit more colour would've been nice, I guess. /notsure Overall, very very nice.
7. This looks a bit low quality too.

I like your effects, its' simple, and it works. I don't particularly like that shade of red/brown, so it doesn't go well with my eyes. But by all means, that's just me. Your text is good though. I wouldn't have done /that/ red for it, but the font and placement is nice. And it's subtle enough that it works. Good job.