I thought I'd post my 12-year-old daughter's latest portrait of Bianca and Ophelia, for which she used pens for painting on stone. They are like bright marker pens and so the palette is limited and the colours can't be mixed, yet she managed to get a brown by interspersing an almost-fluorescent orange with black and merging them together with a pencil. This one will go on her wall rather than near the hutch!