The first style is in practice what you've seen so far in my games. Mostly dialogues, there can be some descriptions of course, but most are direct dialogues between the characters.
Lame example made by me:
The second is what you'd find in books. The main reason I'm asking is because if I hire other writers, they might be familiar with this writing style since is the same you use in books. It's also the style you commonly see in CYOA games:Tanya: "You look good today."
"Tanya crosses her legs and looks at you."
Luke: "Uh.. thanks."
Lame example made by me:
Finally the third option is for people who don't care much if it's written a way or another, but matters only the idea and story. Of course in general that's true, but for people voting, means that if the idea was the same, they wouldn't care if it's written in the first or second way"Tanya crosses her legs and looks at you, and with a subtle voice says "You look good today."
Unsure about her intentions, you reply "Uh.. thanks."