Escher is great. I like the one where he is portraying himself on the page by using his reflection seen off of a reflective sphere. His tessellations are interesting, too. I’m thinking of horses and knights or salamanders.
I like Rothko, too. They are simple but have a presence that invites an emotional response. Aren’t they rather large in real life?
I’ve seen the Ginoux painting and the colors sing!
As far as abstract art, I think you have to have the capacity to enjoy things that you don’t understand intellectually-for me American football is very abstract.