I think they should be even more white if just possible. Here are few examples :
http://depts.washington.edu/ctltstaf/yms/rivendell2.jpg
http://depts.washington.edu/ctltstaf/yms/rivendell6.jpg
http://www.dylancolestudio.com/Matte..._Rivendell.jpg
http://www.goodreads.ca/wordpress/wp...2/fotr0656.jpg