I am trying to do this illustration with more of a sense of procedure than I have used in the past. There are some best practice type things I want to get better at doing such as saving any brushes I create and using an indexed color table. This time I did save my brushes (used to lay the groundwork for the tree canopy in the background) and made a color table. The color table really helped and I need to remember to use them more often.
Despite the custom brushes, I am like most digital artists (based on what I read online), I am perfectly content with only 2 or 3 brushes--generally the simpler the better.