Here's an interesting take on techniques to open up your characters' inner lives for your readers' scrutiny. The comments are very good, too. It's something that I had to work to learn how to do in my own work. Funny thing, in my last book I was careful to make the inner life of my MCs pretty accessible so that motivation would be easy to figure out, but I got a couple of review comments that found fault since I didn't give them enough descriptive -- hair color, etc. LOL! You just can't please 'em all!