That Rivendell shot has always bothered me. One of the trailers has it ungraded. If it was grainy before, it's going to look grainy now. Unless your correction is introducing the grain. I know heavily using the Chroma Key did that for me. Or it could be that the compression is just more noticeable without everything being the same color.
I assume you're using the video from the Extended Edition as 2 discs makes it much less compressed.
Galadriel looks like a ghost in the last official shot.
Here's another photo edit.
[url=http://www.uploadfile.info][/url]I found a few behind the scenes photos.
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[url=http://www.uploadfile.info][/url]Most if not all are from a site called Fantasy Planet. Not sure what language it's in, I found them on a "lotr trailers" google image search.