All effective descriptive writing is fueled by character and is in the essence a form of interiorization. What is seen and described is purportedly not seen and described by the author, but rather through the eyes of the point-of-view character; thus everything that character sees must mirror what he or she is feeling. If you character is angry or upset, what he sees of, say, a room will be different than what he sees when feeling calm.
Author: Lucius Shepard
Book: Paragons: Twelve Master Science Fiction Writers Ply Their Crafts