This is a great picture, although there's one thing missing. Was this supposed to have dragons in it? It seems like there were some things here I mistook for them. It's still a fantastically detailed picture. Is there supposed to be a battle going on? I think I see smoke rising.
You did a great job with the roof tiles. I guess those red things are just flags floating. I love the idea of flying Viking ships. It was a bit hard to tell they were Vikings at first. Why is Vikings always capitalized?