Cloudy days can be some of the best day for photos.  We are in Utah for a couple of weeks.  It was a cloudy day with chance of rain and snow so we were taking a lazy day in the room.  My husband was napping and I was playing on the computer.  He got up and said "the sun is out".  It took us about a minute to hit the door and head up the mountains to Arches National Park.  We were rewarded with an awesome sunset. And best of all no tourists.  Great place to visit in the winter.