I don't know what it is, but something about these photos are just not doing it for me. They all look like snapshots. The last one is my favorite of them though, because the foreground is interest.
In the first one, I think you'd have been better off exposing for the shadowed part of the...
Its great! I kind of wish the sky was a little more interesting though. I think I'd crop a little more out of the sky to make sure the horizon was directly in the middle of the photo. But I think you nailed the exposure and I actually really like the rocks sticking out of the reflection.
I'm just curious here. Do you professionals find yourself sacrificing the Art? Do you lose the passion for art by having to conform to whatever the client is willing to pay for? Do you lose some expression?
I think I'd crop a bit from the bottom out, kind of like @john.margetts mentions. The picture does look like the bridge is the background and the stream is the subject. I'd probably crop out the bottom right 5 rocks, as they're OOF anyway.
Those red and yellow highlights on the rocks in the foreground are killer! I'm no professional, but I bet you're gonna get comments about cropping a little more of the sky and moving your horizon a little higher.