>>33297091) Understand that mood is a visual language representing a sense of "moment"
2) Say you want to capture the feeling of "can't sleep, up and doing stuff in the middle of the night"
3) Ask yourself how you want to accomplish that: through a narrative? through color? through human expression? through common visual motifs?
4) Look into artistic depictions of liminal spaces and don't be afraid to borrow ideas from other artists
5) This is where creativity comes in.
6) Skip the above steps and throw a filter on any picture - it doesn't matter