I am looking at the work by Jan Banning and trying to understand how he color processed this image
http://i.imgur.com/4GdYH1t.jpg Would you select each part of the image and work on it separately with curves etc, or can this be achieve by effecting the image globally?
1. Duplicate image to new layer.
2. On top layer, run the GIMP G'MIC Freaky Details filter.
3. Set top layer to Saturation mode at 90% opacity.
4. Optionally, do some light masking on the eyes so that the redness isn't amplified.