Starting the image
I want to paint an alien market stall, inspired by the fishmarkets in Asia. I open Procreate on my iPad and tap the + in the top-right corner to create a new canvas. I select Custom and choose 4,096x2304px, which is over four times HD resolution, but the same aspect. In the Layer menu I tap Background and pick a semi-dark blue/green in the brand new Color Wheel tool.