^ I agree. Last one is the best, but I don't think the banner ruins it. It's quite good and it has a focal point. It's a good one.

The first signature, like they have said above, too much contrast and the BG is too sharp, not the render itself. Render could be blended in a bit more as well. I think it might be better if the text is moved up a bit however, it's my opinion and I'm not sure if you like it up there anyway.

The second signature is okay, the worst out of the 3 signatures. Firstly, the render isn't blended in properly and there's still white bits on the back of the right hand side render's head. Plus that white bit at the right side isn't really helping imo. The text is okay, not too bad. Nice signatures and nice try