Find Your Dry Brushes
With oils and acrylics, using a dry brush is a very common technique. To simulate a dry brush in Photoshop, pick a default chalk brush (or any brush except Round) by clicking the Brush Preset Picker in the Options Bar, clicking the right-facing arrow, and choosing something like Natural Brushes 2 from the list. (When the warning dialog pops up, click Append to add these brushes to your current set, or OK to replace them.) Next, open the Brushes panel (Window>Brushes), uncheck everything except Smoothing and then lower the Flow setting in the Options Bar.
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