I always have a stack of prepared paper available. This is Yupo paper that I painted with violet acrylic and then stamped on hearts. The dog is sponged in with white ink. I used watercolor pencils for the eyes, nose, and mouth.
https://www.etsy.com/listing/987469431/white-frenchie-with-blue-eyes-french?ref=shop_home_active_1&pro=1&fr