I don't have much to add about the upcoming Twilight manga adaptation, but one thing jumped out at me when I saw these preview pages in Entertainment Weekly:
Poor balloon placement.
IIRC, this is artist Young Kim's first comics work, and in these pages it shows. She neglected to leave enough room for the word balloons, and as such we get the semi-transparent balloons so as to try to show the art underneath, or balloons covering up half of a character's head. For example, panel 3 of the second page above, where you can barely see Bella's face squeezed between the two balloons.
No offense to Kim, whose character designs I really like and who seems to do a decent job with the storytelling. But an editor really needed to point out the balloon placement deal on the layouts...