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There are many ways to paint shadows. For covering large areas such as your example, here is one way.

• Create a new layer above your texture layer and fill it with black (or dark gray). Change the layer blend mode to Multiply.
• Add a layer mask to the black layer. Fill the layer mask entirely with Black.
• Select a large, soft brush and set the Flow to about 5%. Paint with white in the layer mask to gradually reveal the dark shadows. With the Flow set at 5% you can better control how much shadow you reveal by painting multiple brush strokes over the shaded area.

You can also do the same thing with white to create highlights. Painting highlights next to shadows is a good way to simulate depth.

• Fill a new layer with white and change the layer blend mode to Soft Light.
• Add a layer mask and fill the mask with black.
• Select a soft brush and set the Flow to 5% to gradually paint the highlights.