1 - Was not fond of the first and third sigs, and found the wall's background somewhat distracting. The water reflection at the bottom was a nice touch, however.
2 - I liked the first sig, but it lacked appropriate lighting and I didn't like the light bar on the left. The second one looked entirely too basic. The third one I felt the render was trapped behind too many C4Ds, but I'm generally not partial to that style in the first place.
3 - Loved the text modification here on the first sig, nicely done. Indifferent as to the second one, but again, the text was very well done. Great smudging and an excellent choice of render for the third! Perfectly placed text here, too.
4 - Text is hard to see and the sig appeared too "solid", if you know what I mean. Better on the second one, but I would have preferred more emphasis on lighting. Not too impressed with the third, I guess the interesting part would be changing the iris's color, but I don't know what it started off as. Not fond of the text, either.
5 - Cool effect with the watch, and creative use of text in the background, on the first sig. Again, nice text placement and design on the second, but lacking a render left me somewhat dissatisfied. Interesting use of smudging on the third sig, but I didn't find the render appropriate - it was too small and I wasn't sure what you were trying to achieve there.
6 - Nice coordination with the all vertical sigs here! Text is a bit off on the first sig, and too simple on the third, but the common themes of red, love, and women show that this team worked together to produce their compilation.
I'm going to vote for team 6, but signatures that I would like to highlight outside of that are 1-2, 3-1, 3-3, and 5-1.