Sry man, I didn't realize u had a topic posted.
On to your sigs.
1st - pretty damn good. A bit of an overused render but you'll get that with any spiderman sig. I like the blending a lot.
2nd - This is a pretty good sig. It's a bit small. Also the blending is kinda iffy. It just seems liek theres too much. but overall its not a bad sig
3rd - way too overexposed. Almost half the sig is white. Its just flat out boring and theres not much to look at because it's all white.
4th - This sig isn't bad. Tbh though I'd completely take out the render all together. It doesn't go with the sig at all. I think you have a really cool bg. So IMO you should just take out the render all together and see how it looks.