I really like the landscape. Only thing I don't like is the dead tree (just doesn't read as really part of the rest) and the tower does give a point of interest and everything, but kinda steals some of the glory from the terrain, a little, in a way.
The bridge works great for me though, pretty perfect regardless of what period its from.
About the christmas card thing... Curious what period of Roman history that tower represents? Not that it would bother me, but if it is from "Pagan" Rome, and it is for a christmas card, you may want to be sure of your metaphors.
On the other hand, maybe you are exactly sure of what you want to say, and are saying it very smartly? Could go a lot of ways with it if one wanted to... Which does make the image much more interesting.
Heaven forbid an artist makes art.