Done and done.
I tried to establish a more clearly defined boundary between tree leaves and grass as them flowing together didn't sit well with me. Added the little areas of sky as visible through the trees in the upper left as a sort of consolation for making the trees' leaves much too opaque, but it's tricky to make green grass visible through a green leafy mass not seem like just another part of the green leafy mass. Didn't get around to salvaging the tree line to the right of the beast, but these things happen.
The smoke as probably the last thing I did, and I am quite surprised that it turned out as well as it did. I also managed to salvage the middle stream from gray spaghettiness by referencing the rightmost stream and what was the happy accident of the horizontal wave highlights. Don't think it makes sense from a fluid dynamics point of view, but that's probably expecting too much.
Compositionally, I don't know if the white foamy mass of water works too well as it is very distracting, but it's probably not my least heinous transgression against whatever 'rules' there may be.
I never got around to really capturing what I set out initially to capture, which was the play of shadow and light of bright yellow sunlight on and through the leaves of trees. I sorta rushed out some generic blob shadows at the very end, but I would have liked to make these more elaborate. In the end this probably turned out to be more about the water and gryphonbeast than about the trees. But it was a good try I think.