Hello Michael!
Thank you for your comments! I'll try it today. Your verdaccio method meets my favour too, but I haven't COG and MB. I'll try to buy (or order) next week. I feel painting is a very funny job for me; I would be doing it without interruption for 10 or 12 hours. This is a special feeling, as the 2D became 3D.
I'll post the final result next week.
Thanks again.