I've done pointillism for 28 years. I taught my self after reading an article in Artist Magazine. It was and still is an amazing form of art. If hidden my Booboos in the pointillism. My choice of pen or rather what I learned with was radio graphic pens all sizes of nibs. Of course back then they didn't have pens like they do now. I still use my old pens. The iguana in this artwork is amazing.