2. Foreground and Grass
I created my grass using a default brush, included with Photoshop, which you’ll find in your menu of brushes. However, feel free to create your own grass brush for a more advanced application. Also, you may want to place some rough, longer grass in one part of the image using the default brush, and short, well-groomed grass in another with a custom brushas on a real golf course.

To create a custom brush for the grass, make a handful of grass in a new document using any drawing or painting method you choose. Select the area of the image you’d like to use as a brush, and choose Edit > Define Brush Preset. Your new brush will now appear in the brush tip presets seen in the Brushes palette.

These are my Shape Dynamics and Scattering settings, but yours may differ depending on the effect you want.

Several grass layers were created to portray the illusion of depth, with some in front of the ball and some behind. The golf ball is not right up against our fictitious camera, so you can blur any grass in front of it to create a depth-of-field effect. The same goes for grass behind the golf ball. You can achieve these effects after you create the grass by applying a Gaussian Blur filter (Filter > Blur > Gaussian Blur) to those layers. Your blurred areas may vary depending on where your ball is in the scene.