Looking for a Painter Brush similar to Marilyn Sholins MS_Messier Brush from her Elegant Portrait brush set

I'm looking for an installed Painter brush with the look of Marilyn Sholins MS_Messier Brush from her Elegant Portrait brush set. It was used in this tutorial at the 7:53 minute mark.

https://youtu.be/rZS6y_rpHJE?

Thanks