>>7718946 (OP)
A lot of it honestly just looks stiff and stale, and like it lacks passion.
I get its purpose, and that it's there to help directors and hands in the art departments do their thing, but somehow having something so passionless as a starting point feels like it would effect the final outcome.
Meanwhile you look at the concept art for the early final fantasies, and they're quite different from the final product due to technical limitations, but they're just so full of character and (seemingly) passion.
I think it's better to just draw your own scenes and worlds, and if a director finds your work and likes it, you'll (hopefully) get hired. Entering as a concept artist seems to snuff the flames of creativity - to me anyway.