I used a wooden base, which I had already used for a painting. Treated it with rough Gesso, andyou already have a textured underground. The rest was hard work. I deliberately restricted myself to 2 colours: Windsor blue and alizarin crimson. Plus titanium white and some Paines grey.
Acrylic on wood 42x62, took 2 hours in the atelier and about 1 hour post-production.