I remember taking an acting class many years ago and being told to feel everything you can about your character, to get inside their head and feel as much as you can through their eyes. Naturally, I've read a lot of writers deliver their own interpretation to this idea: "Oh, well, it's not MY book, it's the characters. THEY tell the story."
A few years back, after years of rolling my eyes, I started believing as much as I could into my characters. In truth, I did three things I believe have helped my writing considerably.
1. I imagined being the character.
2. I read my prose out loud to someone.
3. I stopped worrying about the nitty gritty.
#3 is what I want to last comment on. I have read so many books by professionals talking about active voice, be 'immediate', start your book with a hook, instant instant instant! Don't hop heads, don't put too many character names in one sentences. Of course...the list could go on and on, but I believe it's all a bunch of bull. If you successfully enter your character's mind, a story will develop naturally.
Though I am almost always anti-advice when it comes to all things writing, I think this is broad enough to be slightly helpful.
Who really knows for sure...