the colours dont fit very well I think, also there is a big need for contrast in some areas.
like Elrinth said it doesn't read very well whcih makes it hard to crit.
I would say this needs either less but bigger ramps, or no ramps at all (like helm would propably do it), and also you might want to add some hue-shifting
Like this it looks flat because you only have a few shades for each hue which are somtimes quite near each other.
