Well, you wanted the truth...
1. They are both pretty auful... although in some places they are ok.
2. The second one isn't a signature, it's a banner.
3. The colour schemes and overall designs are quite amateur, and very unproffessional - this is basically because of the colours and how "busy" it looks in the background. It could also be that the text is badly placed, and doesnt match the signature/banner.
4. I like the second render, even though I hate renders... although it doesn't go with the background or the banner at all. Did you blend it? or did it come like that, because if you did the blending, it's damn good.
Hope this helps a little, even though it's pretty nasty critiscm,
Steish