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Open the image in GIMP, right click on the image and follow the menus Filters -> Beautify -> Beautify... The Beautify dialog will pop up. Pick up the Basic -> Sharpen effect.
Pick up the Art -> Sketch effect, set the opacity as 70%. And then pick up the Art -> Life Sketch, also set the opacity as 70%.
Pick up the LOMO -> Retro LOMO effect, set the opacity as 35%.