Writing Lessons Inspired by the Undead and the Furry:
1.) Show, Don't Tell.
Yeah, Jacob says he's in love with Bella. We heard him. Several times, actually, the kid was a broken record. (And honestly, saying you'll love someone until their heart stops beating is...awkward.) But...how does he show it? Actively show it, not just repeat it over and over while inserting insults regarding her boyfriend?
Aside from a bracelet with a wolf charm, there's not much evidence. Dude, buy a vowel. Maybe the reason she's with him and not you is because you won't stop yapping about how you're right and he's wrong. Just saying.
2.) Unless your villain is really, really, interesting, we don't need to spend much time with him/her.
Pretty much, unless your villain is this guy...
...or this gal...
...just assume we're not all that emotionally or intellectually invested in this person. Sure, we respect that he/she needs to be there as a plot device, but given the choice we'd rather be hanging out with the main characters than with the army of baby vampires and their problems that mean less to us than what Alice picks to wear on any given occasion.
3. Be aware of your pacing.
Pretty much, you want lots of rising action, no matter what genre you're writing in. And when you reach your climax, the amount of time you spend in it should be directly proportionate to the amount of time you've spent building it up. So, if (for instance) you've been having issues with a certain redhead for three books/film installations, maybe dispatching her three minutes after she and the protagonist share the same screen is a bit quick. Just a little.
4. Establish your universe perimeters early and stick to them.
I may be missing something, but I don't remember Jasper having a southern accent in either of the two previous films. I don't remember references to a drawl in any of the books. But suddenly, he's so southern he sounds like he's auditioning for a role in True Blood.
Also - when Vampires die they shatter? I don't remember this. Did this happen earlier? Do they splinter? Are there shards?
Are they extra-flammable? Because Victoria seemed to catch fire real quick. The whole thing reminded me a little of the second Hellboy film, the way the Elves turned to ivory or alabaster or something after they died (I couldn't tell which, but it looked cool).
That's what I thought about when I watched Eclipse. What did you think?