I posted this question also on facebook and got all yays, with suggestions to make it more colorful.
Although I really appreciated the ideas and enthusiasm, I decided against using it for a Christmas card. In fact, I’ve destroyed the painting.
My intention for the painting was for it to not be colorful yet warm but even more importantly, I was aiming for a composition that just wasn’t feasible with the actual scene at hand. I like to stay true to the scene and for it to work the way I had it in my head, I’d have to change too much and make the scene unrecognizable to people that actually know the area. It was not even close to what I intended.