I'm not great at critiquing graphics since I suck at them and the ones I do critiqued have graphics better than mine. XD; I'll try my best, though.
I love the text effect you did on this banner (that is, if you did that ^^; ).
This I thought you did the render and the effects well, but for some reason the red-ish vertical box bothered me. Maybe it's because it's put there either for no reason or to fill space in the tag. Actually, a few other banners like Lone Wolf, Splash, and the Jay-Z banners you have vertical boxes either at left or right side. That's just me, though.
Like some of the others said, the typo you probably need to work on more. To me, the text font you use are good choices, but just needs more effects. However, you're improving in that area.
The update Comic Tragedy mentioned I actually think they're very good, but perphaps have the stocks/renders (sorry, but not exactly sure if you worked through renders or stocks in those banners) scaled smaller and then you can work on some effects more.
Pretty much everything else I have no critique on. Like you're trying a few different tag styles and each one you did well. Keep up the good work!