>>100200245I'm using GIMP but as long as you have something similar you should be able to do it
1. Use free-select/intelligent select tool to select part of character in image
2. Copypaste to a new layer
3. Mosaic filer(In GIMP its Filters>Distorts>Mosaic), use smallest tiles, lowest tile height, hexagons, basically whatever makes them look small but not completely different
4. Use Clone Tool to make the effect drag away from the character
5. On the layer with the original image, use the clone tool and a stamp with a bunch of dots to partially cover the side of the character with relevant parts of the adjacent background. Slightly adjusting opacity can help (Optional depending on image)
6. Use delete tool(half opacity) on the layer with the effect and with the dots stamp to somewhat erase the effect, just enough to make it a dot
7. Use the Spread filter to make it look more like dust(in GIMP it's Filters>Noise>Spread)
