These are all pretty nice. I'm gonna start off by saying though, I'm not a sig expert, or a sig analyzer, in fact, I've only made a few and they weren't very good, I've seen way better all the time. This is just a good topic for me being an easy thing to discuss. I'll tell you what I like, dislike, and how it can be changed.
Sheamus, looks good, although I don't like the two pictures in a row like that, with him holding the title. One on each side could be better, but looking at it in again, it might be a little difficult with the background of those pictures, which kind of looks unique. I'd play around with it if you haven't already still.
The TNA one, I like the Text for TNA, it makes it stand out. There is one thing I see that's bothering me (bare with me, I don't know TNA superstars), but the guy in the middle holding the belt, being that the strap of the belt is black, it blends in with the background making it look like it's just floating out there. Everything else is perfect, the band aid also adds to the extreme feeling of TNA.
The Wolverine one looks nice, nothing too wrong with it. Though these two things are my personal opinion, and don't impact the sig at all. Everything is centered too much in the middle, and I don't like how The Wolverine is over the Wolverine text. This was most likely fully intentional though.
Hard to breakdown the purple one, as I'm not sure who it is. I like the brush you used though, it makes it look like it's dripping, a reddish blood color would look cooler, but once again, I'm not sure who that is, so I'm not sure if that color would fit their character or not.
There isn't much wrong with the Dead Pool one. I like how the colors fit his attire, I also like how the background text links to nicknames or titles of him. At least I believe that's what they are.
The DX one looks perfect. The army like colors that you used, and the dripping DX logo look great with the images you have, and the Army gimmick that they used during their last run. Well, The two smaller pictures of HHH and Shawn of lapping the white part is bothering me a little bit, but the rest of the sig is so perfect, it doesn't even matter.
RVD is..okay. Is he coated in a blue outline, or does it just look that way? either way, it looks pretty cool. I like the design behind him, it fits the sig and the colors well. That's his logo right? The background picture is a little too transparent, just make it the slightest bit more visible. To be honest, the colors don't fit well. Then again, the attire matches, but it just isn't clicking for some reason. RVD uses so many different color attires though, it's hard to find a good one. I see why you used blue though. Thought for a different sig, maybe a rainbow one, just to show his artistic character to use all sorts of colors too, can also work with Jeff Hardy.
I love the background in the Sheamus one, it adds excitement, just because there is so much going on. This whole sig has no flaws that I've seen.
Same thing with Miz that I said with Sheamus, the background looks cool and exciting, I can't tell what the things are on the sides, if they are an object, or just a style brush, but none the less, the way they look matches the rest of the sig, and I like that. I don't like how Miz's arm goes behind the text, it simply looks odd. The text style and colors though look perfect, I like how you made the outline green, and the filling black, mostly because it blends in with the sig.
Not much to say about this one, once again, not many flaws. You could have put the image behind the background though...then again..I guess that's the reason it's called a background. It just seems like The background is more interesting then the picture, and that's why it was brought to my attention. The background is nice though, it has that spacey looking effect, and matches the image too. Not sure who that is either, but the sig if fantastic.
Now I know this isn't part of your showcase, but I like the sig in your signature, the Entourage one. I just saw that show for the first time over the weekend, wasn't bad, but it didn't get me hooked. I do like though, how the white is coming off the text, it makes it look like their walking in fog..like a dramatic slow motion movie with cool music playing in the background.
All your sigs are pretty nice though, they all look professional, with little to no flaws. Good job.
