Wow, great shots!
So here we go with the critic:

#1 Excellent, vivid colors, good composition, good lighting.
The horizon is a bit tilted, but this can be corrected easily in postwork.

#2 Good shot and a nice framing.

#3 Phantastic!!!!!!

#4 Great vivid colors again, nice peaceful mood, good framing.
The picture seems to lean a bit to the left and on my monitor
the right side seem to be a bit to dark.
But I don't trust my monitor anyway and on a print this shouldn't be
a problem at all.

#5 another great shot, aplies for the challenge IMO, but to be honest,
I agree with Bsteph, I miss a certain "umph" maybe try to add some
bells and whistles in PS?

My favourite is #3, technically perfect, nice peaceful atmosphere and a great
composition.
keep 'em comming and thanks for sharing

cheers
Thomas