Pokemon(Harlequins) - Really like the picture used, and the colours all go well. I like the messy explosion in the BG too.
Music #1 - I like the Image used for this one, and the overall signature fits the soft/dreamy style perfectly.
Digimon #2 - This one feels intense, I like the darker colours also, makes him stand out more.
Super Smash Brothers #2 - I like the text on this one, and I think the picture was cut well to fit the signature.