Armand Serrano works for Sony Pictures Animation, has worked for Disney before and on a lot of other projects. Projects include Surf's Up, Lilo & Stitch, Mulan and Open Season 2 just to name a few.
On his blog, armandserrano.blogspot.com, he puts some of the concept art, visual development, background design and layout he has created for the different studios.
There's a lot of great art to see and interesting animation related stories.
All images are sourced from armandserrano.blogspot.com