Here is how
Maybe this will be helpful for someone.
In addition to these paints I used also Vallejo Glaze Medium 73.596.
Paints on palette.
In the first row are paints with a little water. First from top is black.
In the middle row on top is the base color - mix of black, green from Andrea and turquoise (approximate proportions - 5/80/15), on the bottom is white whit a very little of base color, this mix will be used to mark places where reflections will be.
On the right is semitransparent mix for glazes - turquoise, a little dark green and glaze medium (60/10/30)
This method works best on bigger elements. Main idea is to make big white splashes and then add some color and clean up everything with glazes.
1. Sword painted with base mix, 2-3 thin layers.
2. First layer of white mix.
3. Two more layers, even coverage is more important than transition betwen light and dark areas.
Each step is to glaze white spots 2-3 times with leaving center of the spots clean.
1. Glaze with transparent turquoise mix.
2. A little Andrea dark green was added, color changes a little.
3. I added more dark green to the glaze mix, the mix begins to be opaque and more green than blue.
1. Clean-up, edges were painted with white mix, some dark parts got another layer of base mix or black.
2. Final highlights with pure white, NMM
3. Some more colors, added for fun.