Since you aren't painting a recognizable subject, these "building blocks" do the heavy lifting:

Creating abstract art is about shifting your focus from what you see to how you feel or how elements interact. 1. Find Your "Hook" (Idea Starters)

The hardest part of abstract art is deciding when it’s finished. If you feel like one more stroke might ruin it, step away for 24 hours. Look at it in a mirror or upside down to see if the balance feels right [2].