Limit your brush choices
You don’t need to buy premium brushes for these painting studies; it’s all about getting comfortable and efficient with them. I mostly use the Flat and Round brushes at a couple of different sizes. The Flat brush is great for blocking in big areas and cutting into colour shapes to create sharper, cleaner edges. The Round brush enables you to “draw” the colours, develop organic shapes, and is also good for dry brush texturing.