Done for this Manipulation game, using The Great Wave off Kanagawa by Katsushika Hokusai
Some details of the process:
* Saturation and cartoon filter on the original image + some manual cleaning
* Isolation of the foreground and background of the Wave on 2 layers
* Interleaving of the bridge layer between the two others, in darken only mode
* Many hand tuning
UPDATE: it's finally the winning entry of that manipulation game =) Thanks Alisaundra!!