You might find this realistic stone tutorial useful when painting a herdstone as shown here, when painting up scenic bases for your Warhammer or Middle Earth models, or when painting other fantasy wargames scenery and terrain.
Painting Tutorial: Realistic Stone — Realm of Plastic
330 Miniature painting ideas miniature painting, mini paintings
Second attempt at trying to paint realistic rocks : r/TerrainBuilding
Painting Tutorials — Realm of Plastic
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How to Paint Rocks -- Value and Shape for Minerals Done Right
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Real Stone Paint
How to paint rocks, stones and gems - realistic rock painting tutorial
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Painting Tutorials — Realm of Plastic
How to paint realistic stone blocks, Acrylic Painting