My usual technique with anything Photoshop is liberal usage of the tweak-undo-tweak technique. This settings recommendation from PhotographyJam ought to come in handy …
Scott Kelby suggests using the following settings as starting points for Unsharp Mask (USM) in Photoshop. Give them a go:
Subject Amount Radius Threshold Soft subjects 150 1 10 Portraits 75 2 3 Moderate sharpening 225 0.5 0 Maximum sharpening 65 4 3 All-purpose sharpening 85 1 4 preparing for Web 400 0.3 0
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