I did some digging and a lot of research, and I found 30 mock-ups that are worth investing in for Etsy shop owners. A roundup from Creative Market.
Free Photoshop Brush Bundle!
Inside this bundle are my eight favorite brushes I use daily when I am digitally painting in Adobe Photoshop. (And they are the only ones I need!) From sketching to lining to coloring; This brush pack contains them all.