I released another free brush pack for Photoshop! (Clicking checkout will take you straight to Dropbox for those wondering) link in the comments! : r/mapmaking
Mountain Brush Set - Nature Photoshop Brushes | BrushLovers.com
Mountain Brushes for Photoshop Clip Studio Gimp Affinity - Etsy Singapore
Mountain Brushes by Scully7491 on DeviantArt
ArtStation - Mountain Brush Set | Brushes
Hyacinth: A Free 19th Century Mountain Brush Set for Fantasy Maps – K. M. Alexander