A truly wonderful feature of the Brushes app on the iPad is the playback. There are eight layers in this painting: the initial sketch, one for each dog, and two background layers. Each layer can be transformed, resized, and moved around, which you can watch happening in this playback. I was working from a bunch of photos I laid out on a table. Not much planning involved, I just started sketching and it developed. Now to turn it into a painting with real, not virtual, brushes and paint!