Despite this I came during experimentation finally up with an AOP that proved well suited to make portraits. I have tested it on several portrait photos of both my own colleagues and famous celebrities with different hair and skin colour. So far I am satisfied with all the resulting paintings.
Rainbow has a very colourful palette – hence the name Rainbow. It also has unusually soft brush strokes, more like airbrush than ordinary brush. This combination makes it possible for DAP to blend colours very effectively and thus create almost all kinds of colour shades.