[header] How to use the illusion effect in gimp [title] Find a suitable image and open the picture in gimp. [step] For special effects like this, i like to select images that don't stand alone as a good pictures. This picture is not the greatest. 
The lighting is flat and the background is kind of distracting; however, the eyes and facial expression have some impact, so the image may be improved with a special effect. [title] After opening the image, click on filters and mapping to find and select the illusion map.