#1 - Like the smoothness, colors, and clarity of the subject. Seems like I'd like more going on however.
#2 - Love the walkway, the trees at the top of the frame somehow take away from it for me.
#3 - Feels perfect beneath the sky, but I'd like the clouds up top to be still, and have a greater complexity or depth - I love the shot btw.
#4 - I would have thrown a heavier grad and wide lens on if I could, I wonder what's to the right.
You're selling the 800/810 to me quite well I should add.