Is the picture a gateway like a sigil?
Anybody knows if I can treat this like any other evocation?
Yup, you can work with a picture like a sigil, people do it all the time with the Tarot. It can be the base of a scrying medium if you wish to speak to the spirit in the picture.
I have a set of Daemonic Cards bearing the image of a demon that I use to set up altars or scrying.
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