Brushes are a huge part of Photoshop and the skills you need to create digital artwork. This site has some great tips and advice on how to get the most out of the brushes package, and how to create your own. BRUSH TIPS AND TRICKS by Iceflow Studios.
I’m always finding new ways to expand by brush set for portraits, though i have a tendency to stick to using only a handful as I know they’re going to serve me well. However, I’m starting to experiment with some different styles in order to get some finder detail that will still hold up once printed. it’s amazing how different a portrait can look on paper, verses what you see on screen.