tough getting a complex sig like that under the limits huh
anyways...good choice on the layout, except id switch the text up. id try lining it all up across the bottom and going white with some sort of simple border to separate it from the background.
another idea for a sig like that to help the quality is go black and white (or even just barely any color) since they are all legends. it would help the quality, and at the same time make it a bit classy and uniform instead of having a bunch of random colors.
just some thoughts