I recommend going on Pinterest if you haven’t already, they have some great ideas!
The first thing I would do would be making a Mindmap of “out of mind” and all the things I associate it with it.
I probably would have taken a more surrealist approach, such as combining landscape and portraiture. For example taking a photo of someone’s whole face and then a photo of landscape scene like the sea or mountains. You can do this in camera as a double exposure or I would just edit it on photoshop. You can see examples of this on Pinterest to get a visual idea of what I mean.
I hope this helps a little