what i remember of working with 9bit is that there were many, many colors available in the medium-saturauration range that could be used nicely together without burning the eyes. Is there another restriction that keeps you to using only a few colors in each area, or can you add some to round this out? This looks a lot like the kind of thing i sometimes do actually the way it jumps so harshly between shades, it really could use a smooth, and the hues of the intermediate values could be used to add more color depth to the piece