Thanks. That's all good feedback, but I've tried any number of textures for the reflection. They all look no bueno. Refraction is the key, I know, but for some reason, the Refract and RFactor sliders both seem to do absolutely nothing. I've tried a million different combinations, and... nothing.
Could just be a bug in the software, I don't know. ZBrush will do you like that from time to time. I spend a lot of time working around momentary dead ends.