Well, I haven't posted here in a while, but I'd like to get back to it. Any comments are greatly appriciated.
First is the best, IMO. The blending on the second could use some work. Try adding in some vector work right in front of him, and scrap the squares that overlap with his body. On the third, I would work on the text. It ruins the tag. On the fourth, the lighting needs work. It looks like there are two bright circles in the center of the tag, which I think doesn't look good. Move the text up a little so less is cut off. (Only the lower half of the second line at most should be cut off, in my honest opinion.) Work on the blending, with more vectors, on the fifth. Also, work on the text. On the last, it's dark and seems to really lack the spark to be a legit tag. Lighten it up a little bit. Overall, pretty good stuff.