Meets the challenge, thought adjusting a monochrome color tone is not along the lines of what I was expecting. Still, to be fair, it's not like sunsets aren't heavily tweaked to present unnatural levels of orange.
Overall, this is pleasing, but I find the lighthouse to be way too far over to the right. I think a different crop was really in order here.
focus on the top of the lighthouse would have worked better. seems to be indecisive focus as it is. also, there are some dust spots (i realize its basic, but just figured i'd point them out)