You can clone with
HTTPS or Subversion.
Open the image in GIMP, right click on the image and follow the menus Tools -> Beautify -> Beautify... The Beautify dialog will pop up. Pick up the Basic -> Soft Light effect.
Pick up the LOMO -> Film effect.
Pick up the Basic -> Strong Constrast effect, set the opacity as 80%.
Pick up the Gradient -> Pink Blue effect, set the opacity as 50%.
Adjust the color balance to yellow.