After several weeks of research and tests, I now feel very happy with my findings.
I've created a color wheel with 60 degrees separation, based on a main color created from fibonacci's numbers as starting point.
This numbers and angles combinations gave me an hexagon that I then duplicate it and applied a 30 defrees rotation. All this process gave me a beautiful 12 color selection. I feel they ad a beautiful harmony to my body mandala creation. I hope you like it too.