Ishida;; The first one looks quite awesome, for me. Just tone down the large explosion-y smudge bit, and move the text around a bit. Also, add something to the background, because it looks too empty without anything in the black areas. Otherwise, it's nice. I like the grungy feel to it and the colours help convey that. It's a bit close to looking monotone, though, so be careful of that. And maybe add emphasis to the green in Samus' visor :3
The second one, ah, the orange text doesn't go :\ The displacement-ing looks okay, but there's this little white thing on Renji's chin o.o And, well, the banner just seems to be lacking stuff. I have no idea what, though.
CheesePeow;; I like the concept... it's just that the composition is off. The text draws all the focus. Sharpen up the faces of the people a bit, and change the font. It's looking very empty in the middle bit, as well, so nudge the girl more towards the center. Overall, it's just lacking effects :\ It's almost like you're going with a surrealism look, so add some things to represent that there (I have absolutely no idea what you could add, though). But I do like the use of clouds for the background :3
Poke'd;; The background is simple, but nice. The text is difficult to read, though, and you could have gone with a simpler border. The render blending, oh the blending. It's quite difficult to see what I'm supposed to be looking at :\ It is difficult to get the blending down right, though. Most of the time, it has to look like it wasn't just pasted on, but it shouldn't look like a part of the background, either.