Not a big fan of landscape, but this works. I might knock the brightness of the cloud down a notch, but that's just my taste.
How did you get the tone you label "dark sepia" - it's very subtle and doesn't seem to extend into the whites. I've been trying different methods for this and haven't settled on one. My latest is using a photo filter adjustment layer with a custom color choice (usually very light red-orange) and painting on the layer mask to block the effect in the very high highlights or anywhere else I don't want it.