Dynamic is a variable that means different things to different people.
i feel that it means 'to stand out' you could use words like punchy and individual
in film terms it means high contrast either high key or low key.
in specific film terms it means to push the film by one or two stops then develop on multi-grade paper at #5 filter creating a high contrast print.
-----------------
Curiosity killed the cat, but for awhile I was a suspect.