Seems rather dimly lit. This just may be a perfectly normal fast, but you might encourage your snake to eat by adding some more florescent light. Prefererably a natural spectrum such as a reptisun 2.0 or something similar. I've observed that this helped a lot with appetite and activity on more than one occasion.

Often times, keepers get overly concerned when their snakes go off of food. Most of the time it's nothing to be concerned about. perfectly normal. Hard not to worry though. My Amy (albino plains) has always been such a good feeder than one day stopped eating. After about 5 weeks I was starting to worry. About week 7 he started eating again. He didn't lose any weight during his fast. I worried for nothing.

One more thing, sometimes it's not that your snake isn't hungry. They do tire of the same food after a while and just want something different. Might give that a try. Amy does that to me all the time. Goes through periods when he only wants fish. Other times, he won't eat anything but worms or rodents. Try different foods.