All art is abstract, because art is an abstraction of the truth.
For years, I went around the world looking and then painting, but now I have to think first and then paint. It's driven me to find the design concept first, and to rely on my memory and technical skills to supply only those details that are needed.
When I'm teaching, I tell the story of this painting for two reasons. First of all, if you want a good solid color structure, you have to have a solid development in values, dark and light. Second, if you have a good design, don't leave it if you fail to render it to its full extent the first time around. Remember it's the design that's important. Try and try till you get the thing to work. That's why The Pattern Makers is a key picture in my painting career.