Paint Brush are expensive and difficult, might be better to get a mix of wildflowers with some Paint Brush in the mix and see what comes up. Then you can add specific things that did well the next year.
The trick to any wild flower is to let them go to seed after they stop blooming, there's at least a month of dead things that look like weeds before you want to clean them out, so plant the in an appropriate place where that's not an issue.