Fauxhammer has some great tips for drybrushing miniatures that will take you from a noob to a pro in no time- here
Drybrushing Miniatures, the easy way!
Secrets for Drybrushing Miniatures That Everyone Should Know
Drybrush Brush Tests #1: Billowing Cloak Folds – Bird with a Brush
Episode 08: Drybrushing
The Secret to a Smooth Drybrush
Is Dry Brushing for Plebs?
The Best Drybrushes for Miniatures, Models & Slapchop Techniques - FauxHammer
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Painting Miniatures: Drybrush and Highlights