First photo, its very blue, due to the shadows in the valley and contrasting yellow-green foliage around the river, however the composition is nice with the foliage natural framing.
The second image the composition is spot on! Excellent capture of the bridge, natural environment, vibrant natural colours and good use of the shadows. Only CC is that there is a dust spot in the middle of the sky, which is distracting to the eye, but a quick clone out and thats gone, leaving a terrific image!
Third image, I'm not sure about this one, I think it's the height at which is taken, from atop of the flowing water. Im not sure if that was because you couldnt get down to that area or what, but maybe a more eye to eye level on the rocks and creek.
The fourth image I really like the dark hues and colours. There is a couple of small dust spots appearing in the water (I clean my sensor and lenses and yet they always seem to appear in water shots haha) I might suggest making it more to a thirds rule and having less of the rockface on the RHS and the small waterfall more to the right top corner.
Hope this helps. You have a really nice eye and take some great photos. A beautiful area to photograph as well!
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