I like it on the renders, gives them a more drawn look rather than a game render look. And what is making it look like that is the copy layer of the render overlayed in soft light slightly off set from the base render.
I happen to be fan of pop art, so I like it. It looks more animated than pixelated which is what I like. I understand from your standpoint maybe it doesn't look good to you and I appreciate the criticism, i'll definitely keep working on my sigs in different ways. This just happens to be how I like them as of right now. For example I happen to think you have way too much background in your signature and the dimensions of it are too large. It's also too dark, but I like the glow effect. a lot. The outline of your character is far bolder than anything else in it so it throws it off.