Bastiladon Crystal Techniques

So I'm in the middle of painting my bastiladon with the solar engine, and I was wondering what techniques I should use on it? I'm a decent enough painter but the crystal is something I've never tried painting before. Is there any way you can recommend I start or a link I should look at?
Thanks, some help would really be appreciated

 

Dark in the flats and blend to a lighter color as you get closer to the edges.

 

This is what I've done..


But if I were to have a do-over.... I might do less hard lines on the edges and more of a 1:2 ration watered down paint instead.

 

I wouldn't even say those highlights are hard I really like what you've done with that crystal, thanks for the help guys it has given somewhere to start here.

 

Make sure you post pictures!