I was going to suggest raising the black point Looks better, but the fact that the scene is reds, greens, and white (or variations of) I think is going to be a challenge to really make the scene stand out as a monochrome of some sort. To be honest, given that it's the raw file in colour above, I think it has a lot more potential as a colour with little PP to bring out a bit more colour to make the roof lines stand out against the trees.