Nice idea. I can use that with my acrylic painting too! Thanks for sharing!
It's a great process- Joani Barnett (joanibarnett.com) uses it for the distant stars in her nebula series. She's my mom, and I am always learning stuff from her. Great tutorial! :D
I use things like q-tips and toothbrushes as art supplies but I hadn't yet thought of using the toothbrush for that. Thanks for sharing!