Step 2 Select ‘Girl 1’ this and go to Filter > Pixelate > Color Halftone. Use a Max Radius of 12, and for a 100° Angle. Notice the Color Halftone filter works well for large images, if you are working with a small image I suggest you should try the Image > Mode > Bitmap with Halftone and Round for the settings. It has pretty much the same effect.
Step 3 In order to make the effect unique, let’s do something unusual to it. First desaturate the image so go to Image > Adjustment > Hue and Saturation and reduce the Saturation to 0. After that, go to Image > Adjustments > Levels. Change the Black Input triangle to 99 and the White Input to 205.
Step 4 Add a new layer, change its name to ‘Brown’ and fill it with a dark brownish grey (#5a5855). Put this new layer behind ‘Girl 1’. Select the white area of the ‘Girl 1’ layer and delete it. You will have just the black dots. Then go to Image > Adjustments > Invert. Now you will have only white dots on your image.