Haha photoshop! Well, the majority of it was done in photoshop. Just edited a Dark!Jack pic and then split it down the middle and put it next to it's original half in paint XD
Really? I think he's just the concept idea of what Jack would be like if he joined Pitch instead of the Guardians. Hence why the dark side of him has black hair and gold eyes like Pitch ^_^
Ah, gotcha. There's probably some lurking around here, like if in the search you might find some ^_^ Everyone's rendition is a little different but it's generally all the same concept :3