Look at this fun development of the color sketch!
The thing was to find out if I could get this juxtaposition of light right.
(See the black and white sketch here)
There are two worlds overlapping here. There is the world of water, where color is subdued into a greenish bluish palette, and everything is diffuse. And then there is the world of air with sharp contrast, also in the lighting, warm lamps and stark shadows.
Só fascinating!
A white piece of water color paper and the figures of the world of air.
The fish and rocks are sketched in,
The water world is colored in. I thought it worked.
Next installment will be the preparation and the base painting on the gigantic canvas!
Aafke.Art 
It’s so cool to see the process and the finished painting. Love this.
Heee, no spoilers! The finished painting is for the next post!