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Filters can help enhance a photograph and make the scene look better. You could use a filter to change the way the camera captures the image or how the light is effective. Some filters such as a polarized lense can reduce glare and changing the hues.
Colored filters can be used to change to color theme of an image. If you add a blue filter it can make things seem darker as well as having a "wintery" or "cold" feel to it. Red could make things seem brighter while also having a "Angry" or a "romantic" theme.
Answer:
I would either use water colors or a sketch. use darker more drab colors for your work, and then either use lots of details on the building and less on the people. this seems like a draft possibility though, so maybe just get some 2 point perspective of the landscape and/or buildings, and add some details that where/ will be in the dystopian book.