Really neat tower. I especially like the sides of the watchtower are positioned. Overall, nice job. For next time, try adding a bit of landscaping in the background. A frozen pond, some snow mounds, rocks, etc. Something to spice it up!
Yeah I did make the landscape pretty sparse! And I'm unsure about how I feel about the roof but I made the battlements and I wanted archers at the top and I thought "hey these guys are gonna be freezing their nuts off and the top would fill with snow" so it seemed practical to put a roof