Step 5 Group the ‘Girl 1’ layer (Cmd/Ctrl + G) to create a folder with one layer inside it and change the folder’s blending mode to Color Dodge. You will now have a folder with one layer inside it. Select the ‘Girl 1’ layer and go to Filter > Blur > Gaussian Blur. Use a radius of 2.5 pixels here. Because of the Color Dodge, you will get a light effect.

Step 6 Select the ‘Brown’ layer and the folder with the ‘Girl 1’ layer and select Layer > Merge Layers. Now you will be left with just one layer. Go to Image > Adjustment > Levels. Increase the Black Input triangle to 140 and change the White Input to 215.

Why we did all of this? With the Blur and Color Dodge, we make the dots that were closest to one another get blended. Then with the levels here we make them solid again. These create a more organic effect, a little bit like molecules.

Step 7 Go to Image > Adjustment > Invert. Then select the Magic Wand tool (W) and select the white area. To get all the whites go to Select > Similar and delete the white area. Duplicate this layer and go again to Image > Adjustments > Invert. You will have two layers, one with black dots and another one with white dots. Call these layers ‘Black Dots’ and ‘White Dots’.