Dot Dot Dot

The first effect is achieved by overlaying 4 grids of dots (CMYK) over the image and scaling each dot appropriatly

The second works similar, but instead of a grid of dots, first high contrast areas are identified. then dots are randomly places given the color based on their location and finally scaled proportionally to how far they are from high contrast areas. As such dots in low contrast areas are larger.

Extras

Colors picked using Coolors