Started stamping the brush image on my cardbase, stamping off onto Post-It notes to make masks as I went along. Fussy cut the masks.
... and then went back in with a black Sharpie to touch up the image along the bottom which had not stamped completely. You can see the imperfect image in the above photo.
Put my brush to some primary colors in my watercolor box and randomly added a splotch of color to some brush tips.