OSL Fire Prism-Update 2

I finished the turret tonight; after working on it for half of Saturday and all Sunday. I'm starting to wonder if I'll have time to work on any other models for the August Games Day. This has been a true learning experience and I have yet to get it right on the first try for any of the techniques I've tried. In fact, the final version of the turret will probably not be the same as you see below.

1. I'm still not sure I like the way the light from the crystal illuminates the tan. The online guides and the article in White Dwarf warn about the difficulty in getting OSL to work on a light colored objects and I definitely agree--illuminate black is easy and tan is hard. My first attempt tried painting the turret as though it was being illuminated by a bright white light and then I glazed over the areas with the lime green (scorpion green). This may have worked on a character model, but the inconsistency in paint application across a long brush stroke (along the armor panels) made it look like crap. I settled on a normal blend technique using combinations of lime green with bubonic brown, bleached bone, and then white.
2. To accentuate the reflections, I've chosen to paint the oval lumps as normal armor rather than gems (as in my original Fire Prism). Although I think I've done a good job at bringing them out with contrast, I'm not sure I like the lack of color the gems provided.
3. Speaking of the gems...in the last version I used green and purple gems. The use of tan, green, blue, and purple always seemed a little too much color. I've nixed the purple in the this version and this is why the canopy was painted with a blue-gray. This is also causing me to feel something is missing.

I'm not sure If I'll paint the main hull or the engines next. I plan of doing some blue OSL on the engines and I think I want to play with that for a while before I move back to the tan. I guess we'll find out next update. More to come....