Fantastic work!
I really love the shore, it's so realistic!
I do have a tiny suggestion though, which is to add some algae/staining to the stones under the water, say greenish tints and add a density colour to the water with density 0.5 for starters. Choose a density colour which is off from the colours you used for algae/staining of the stones.
I'm curious to see how such a setup would look like. I can imagine waters like these have some murkiness to them.
The clouds... Well, this is how I look at it:
Without clouds the composition is slightly out of balance. Quite a bit of the image-space is just empty sky. I suppose in this case rule of thirds applies and perhaps you can make it even 25% sky only if there's something you really want to show off near the camera in the foreground.
With clouds the composition is nice and well balanced. Oshyan is perhaps a bit too sensitive about the clouds being the same as in a previous render, but I admit I recognized them immediately as well
The clouds look a bit broad and flat perhaps, so should you choose to go with a final version with clouds then perhaps you could try different seeds and shoot for a little bit more vertical profile for cloud shapes.