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A small thing I've noticed from teaching -- character descriptions in scripts. A lot of young writers either write nothing or write a full paragraph of descriptions for their main characters. I think both are wrong -- you want to give the essence of the character in one sentence.
I would stay away from physical descriptions unless they're important to the plot. Unless it's super important their eyes are green, it doesn't *really* matter, and do you really want your lead to have to put in green contacts every day if they have brown eyes?
My favorite casting description (which I think were in their initial sides) is of Angela from The Office: "the type of person who says 'I don't mean to be rude, but...'". It's perfect. One sentence that tells you *exactly* who that character is and how to read their lines.
(yes this is a tv writing tweet from me i do them every once in a blue moon when i'm avoiding work)
