Writers often talk about their "creative vision". But what is that?
Broadly speaking, your creative vision is the artistic rationale behind your work, and your expectations for its realisation. This can include any aspect of the piece, from the soundtrack to how it looks.
Your creative vision is not usually something you can just decide on the spot, before you start writing. Instead, it develops as your idea takes shape and you work on the characters, storylines and script for your project.
Some shows, such as The Mind Of Herbert Clunkerdunk, have very idiosyncratic creative visions underpinning them.