The ArtStation Marketplace is uniquely valuable because the assets are typically created by currently working in AAA games and film. When you buy a "Brush & Alpha" pack, you aren't just getting files; you are getting the specific tools developed to meet production standards.
: Perfect for non-destructive detailing, decals are pre-made 2D graphics (like warning labels, rust patches, or sci-fi panels) applied to a surface to add visual complexity without increasing polygon count.
: Custom brushes often combine specific alpha data with unique stroke settings. They are vital for painting realistic hair, weathering effects, or organic textures in Substance Painter.
: These are grayscale images used as height maps. In sculpting programs like ZBrush, they allow you to "stamp" complex details like skin pores, fabric weaves, or mechanical bolts onto a mesh instantly.