Finaly I've invested some money in a 48 pack of Touch Marker (an alternative to Copic Marker) and I must admit, it's just too much fun to color with them! I've chosen to try them on an Art Deco style picture. I wanted to ad more details to the drawing, but I lacked refference material, so I kept it simple.
I used the blender marker quite often and I think I love that tool.