I think I like version 3 best, though 2 and 4 are good too.

Version 1 isn't bad but I'm having a weird disconnect between the red-coloured roofs and the abbey at the left. They don't seem to 'gel' together for me and feel very different in tone. Perhaps you wanted a startling difference, though? Version 4 has somewhat the same thing, though it isn't quite as pronounced. I also feel Version 1 looks very faded and washed out.

What sort of climate does the area have? I find Version 3 cold and snowy, whereas Version 2 looks hot and sultry.

I think I'd like to see Version 4 with the roof colours' saturation turned up a little bit, though not as much as version 2.

Hmmm, I'm not sure I've actually answered your question. Any but number one, basically.