Our principles for mixed media graphics really helped in creating a consistent graphic style. We’ve learned that:
1) You should always aim for a target for 2-3 colours across supporting graphics. Otherwise the graphics become overemphasised, and the colour theory ruins the set and costume design.
2) Photos shouldn’t be too colourful. The dominant colour within the photograph should match the graphics and either the main subject’s costuming, or a neutral black, grey or white.
3) Text should be made minimal where possible. If you need to represent text in UI, you can use a vector shape of a line — this is a good way to simplify text that can be overly distracting.