I thought he looked darker in the first pic but I think it may be because your pictures have such different backgrounds especially comparing the 3rd pick to the other two. One suggestion I got from a breeder was to get some color sample cards from home depot/lowe's that match your animal as closely as possible then compare him to those in the future to see if there has been a color change. I haven't gotten around to doing it yet but I thought it was a great suggestion.