You've got quite the collection here. I really liked the Bowman and Soccer signatures from a couple pages ago. The Naruto ones from early on are very cool too.
The Iron Man on page 5 is possibly my favorite of yours though that might be a preference of mine based on the color. I never cared for the Red and Yellow on the Iron Man armor, I think the silverish gives it a nice look, especially with that lighting.
Edit: I just came up with a question on the one you made for me. What is that image you used for the background?
It looks like some different clouds to me.
umm the image for the background was the render itself(captain america) I just duplicated the render(captain america) like 2 times, and smudged it, then just put an untouched version of captain america on top of the sig, added a little gradient, and i was done, the whole thing is 6 layers i think, not that complex 😄