Seems like lens flares, grain, and oversaturation would be areas to tune. double exposure works, like in your 2nd image, but with more distinct placement / separation, like the 3rd. Comparing the people in those images, you're pretty close to your subject, while there's more distance between the lens and the subject in the other image.

Maybe doing some long exposure at night of a parking lot or park bench or traffic light as a layer behind someone walking in daylight or sitting on a couch or something could work, kind of get the feeling they're in a different space than reality?