The second is clearly my favourite and I like that you kept that line of land at the bottom as an "anchor" for that sky! It could do with a slightly more "sculptured" definition, though, I think, like upping the shadow levels from 0 to 12 or 15, and likewise upping the highlight levels from 255 to maybe 235 (or wouldn't that rather be: lowering?), and if then the yellow saturation (only that, no other colour) could be intensified and a bit of unsharp mask (not too much!) were applied, I think that one'd really be breathtaking!