Your walls are reading very yellow, making them appear a little dingy.  This is because they're west facing windows and you need a cooler white, or a soft green.  Here are my two recommendations.

 

Wall color options through Clare:

Dirty Martini

Fresh Kicks

 

Fresh Kicks could also be used on your ceiling.  For the same reason, you want a crisp, cool white there as well.

Clare No-VOC paint

$49.00Price