In an interview, a former studio executive said, "Hollywood is the world's largest gated community." The entertainment capital of the universe, the $91.83 billion industry, the "who-knows-who" business, is indeed uber tough to break into. When it comes to screenwriting, there are no rules in Hollywood. Only "customs". But they are stronger than laws.
A script is meant to be read
So, make sure the ride is fun all the way through. Not just the conversation. Not just the description. Not just the first one. Not just in the middle. Not just the ending. A writing with precision, felicity, and fluency. Finally making your reader say, "Great read!"
A screenplay is not a novel
A script is not just prose like you would find in a novel. It is writing that works for a movie. A screenplay is a blueprint for how to make the movie. A piece of writing that makes the reader feel like they are in a movie. If a novel is the "gossip", a screenplay is the "scandal".
Short sentences
A survey shows that consumers are more likely to try bite-sized cookies or samples. Before they know it, they can't stop wanting more. Ren Descartes was right: "Split each problem into smaller parts in order to resolve it."
Short first paragraph
First impression is the instant opinion formed when encountering someone or something for the first time. That's your first paragraph! That is the "prototype" of your writing. Is it breezy? Or is it a drag? Your prototype is their stereotype.
Short description
"Lonely beach. Naked feet. Velvet sky. Starry eyes".