Some work.

[JDBar]

Why would he need to watermark it? I've never in my life watermarked anything I've ever made. I think it's really annoying to see a watermark on a piece of artwork that isn't going to be sold or anything. (except Conspiracy's watermark was really well done and became a part of the art itself)

Anyways, the two sigs look really nice. I especially like the Iron Man one; the color scheme is very appealing. The banner is really odd and doesn't show a whole lot of effort was put towards the composition. The (vector?) lightbulb needs a little more detail in the screw part, and the "flower" bubble things are just poorly made.

And as a graphic designer, you have to open yourself up to criticism and maybe critique other designers yourself! It's good to have an open mind in this sort of thing. I'm not saying you have to follow every picky detail of someone else's ideas, because then you'd be giving up your own graphic style. Just listen and don't be so aggressive. If you don't want critique, don't post em.

It is entirely your choice to not upload the .PSD files or watermark them. Do whatever you want, because that kind of stuff isn't critique or advice. There isn't really a reason to believe you didn't make those images, in my opinion.