I agree, the sponge rulez!!!
Jopano, 7/10,
don't care for the beveled edge (doesn't actually give the siggy any depth)
also, the font is boring, add some depth to it.. make "Japona" stand out more..
The good,
Nice blend in color, though you can easily change the texture color to a gradient and then polarize it with either wind or water. Would make the background really stand out.
The work on the beaver (or is it a bear) looks very good.. give that a 10/10
Depth to the text, with Jopano standing out
Change the texture to a waterish color and polarize it.
might then have the best "new" siggy around.
edit: also, erase about 1/2 an inch on the left side of siggy allowing the text to begin off the background edge
Just my opinion, it looks good as it is but... thinking it would look better as suggested.