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 Brush Set Pack - Dolomiti 25 Brushes by MattiaMc on DeviantArt
ArtStation - Mountain Brush Set | Brushes
ArtStation - Photoshop | MA-Brushes >> MaxRealistic Photoshop Painting Brushes also for MOUNTAINS!