Well I think I am going to have to go colour blind.
I need to make a prefelt picture based on river edges in fully saturated colours. Well such a thing does not exist in the natural world. I have lovely pictures of rocks and Autumn leaves with swirling water, and drippy moss covered rocks with ferns hanging over them. Which need to be depicted in the colours from a rainbow and using colour values instead of shades and tones. I really do not understand the advantages of this colour value approach. I know Henry Mattise used it , but I am not sure I am up to it.
It calls for a radical approach. First I must forget the natural colours.
Orange leaves will become red , browny rocks will become warm yellow with blue to show the texture and the moss. The water needs to stays warm blue with cold blue and cold yellow to give movement.
Here is what is looked like in real life.