OK - first, let me say the colours you have here are AMAZING!!!
With that out of the way...
1. I really like this, but I think what lets it down a little is the highlights in the water at the bottom. Not sure what you could do about them - maybe some local treatment with a dodge tool perhaps? The other thing you could do would be crop it just below the big clump of grass - just b4 the bright rock comes into view.
2. I think would benefit from a crop at the top, so the sky behind treeline is left out. Personally I would also have got rid of the red leaf.
3. Works better without the foreground - it's a little bare, and you appear to loose the sharpness in the closest rocks
4. LOVE the clarity and colour on this - really nice
What are you doing with the colours? Because it is working amazing things
Hope all that helps - remember it's just my opinion, which in the end may not count for much
