Nerys, what medium did you use here? Charcoal? Because I was staring at it, and the blending has an almost charcoal quality.
I actually used pencils, from HB all the way through to 6 or 9B, if I recall correctly. I used a blending stump to do the blending work--not exactly realistic in the style I used, I know, but I love the way Cardassian aesthetics work with an Art Deco approach.