Lighting Effects - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 203

Figure 3.47
If we'd applied this effect to an image where the floor was concrete, this would be
sufficient. However since this is grass, we need to take it a step further to add to
the realism.
5. Still with a white foreground color, grab the Brush Tool and choose brush number
134 which looks like three blades of grass ( Figure 3.48 ).