This short tutorial shows how to quickly swap faces in a single photograph, using the open source G'MIC plug-in for GIMP
(available at : http://gmic.eu/gimp.shtml).
Fun and easy to do at the same time !
Music credits : "The Banshee. Gravel Walks. The Old Copperplate" by Sláinte (https://vimeo.com/musicstore/track/38..., under CC-by-SA).