The Cacapa sig is great. The background has been blended in very well with the front and the lighting works very well. Perhaps some more work could be done on the render towards the left as there's a sudden change and I feel it would look better with a gradual fade. The text is great but perhaps "Newcastle United" could be more visible than it currently is.
Well, I'm not a fan of the effects on the Manchester United jersey in the Ronaldo sig as it's it creates too much of a contrast between the render effects on his face and his jersey. The background is great (love the designs). The text could be better as it's too small and cannot be seen. If a few things were worked on, this sig would be absolutely brilliant!
Keep up the great work Culli!