About my double exposure:
I used myself, and a screenshot of a video game called Townscaper. I took the inspiration of an idea of one's brain represented as a functioning city, and that's what I reflect in the artwork.
Techniques used to make it look better:
Brush tool, with 0% hardness — This is useful to create soft edges, and to create a gradient effect on the water part of the town.
Black & White filter — I used this to not only make it look better, but it also helped to make mistakes more invisible.