They're all very good, lets see.
1st: A little over sharpened maybe, the LQ definitely shows. There are a few colorful sparkles over the render's face too, which I don't really like. But other than that it's a pretty good tag, nice style.
2nd: Looks nice, textures rock. The ear, however, looks a bit strange, but whatever, personal opinion I suppose. I think the part under the chin doesn't sit very well with me either, but yeah, whatever.
3rd: Eeh, it's alright, kinda monotoned, but I saw the stock, not really much to work with there, you did a pretty good job with what you had. Not much else to say.
4th: Pretty cool, I like it. I feel like the lighting should be better, the bright part of the spaceship doesn't even have any light shining on it.
5th: Looks over contrasted I think, but other than that it's good. I like the effects, they're good. No colors? It's probably better B&W anyway.
6th: It's cool, the one with text is best imo. The sprite looks like it's almost blended too much though. Good effects again, it's not bad, not my favorite, but not bad.
7th: This one or the next one are definitely my two favorites out of the bunch. I prefer the first version. It does, however, look a bit over sharpened, I don't know if there's a problem with my monitor or something, but it definitely looks really sharp.
8th: Like I said, either this or the 7th one is my favorite. I like the effects a lot. I like the crop better, but yeah. The flow could have been better, probably a different sprite would have helped. Seems like a very similar style to many of the others, but it's good, you really do it well.
9th: It's okay, some of the effects are good, but the overall tag just doesn't sit very well with me. Some of those effects could have been good in the spaceship one, but whatever. If that bright streak behind her was a little lower, it might look like she was farting
10th: It's pretty good, it might be interesting to see what that looks like in B&W, but I dunno. The two color thing is meh, never really liked it personally. But the style is nice, good going.
Overall, very good, 7th and 8th are my favorites, really good stuff.