Turn any photo into a dot grid artwork with these Photoshop actions. You'll get great results with dots that change size. They get larger in brighter areas and smaller in darker areas. Free download available.
Change this layer mode to Soft Light 100%:
I used Color Balance to add some cyan/blue to the image:
I used Selective Color to adjust the cyan settings:
I used Curves to increase the contrast of the scene:
On this layer mask use a soft black brush to erase the area around the model and circles to keep its lightness:
I used Vibrance to enhance the final effect:
On this layer mask use a soft black brush with the opacity about 40% to reduce the effect on the light around the circles: