I did 4 in digital using ProCreate. I used the round brush and flat brush. For the smudge tool I used old brush. I'm not used to using digital tools for this sort of project, so it was a great opportunity to practice new techniques and expand my skills. For the 2x2 gouache thumbnails, I used size 12 round brush, and 3/4" flat brush. I took a picture of all the paints I used. I didn't realize until starting that I didn't have any warm reds so I had to get around it as best as I could.