I like the changes you've made. Pardon my detailed mind, but here goes (you asked for it):

The two tiny bits of sandbar sticking out of the water don't look natural to me - i don't think you'd see something like that very often.

Have you rotated any of your pine trees in different amounts? They all look like they have the same sillhouette - especially the two furthest to the right. At least rotate one of those. They're the same size and the same shape.

It's unclear to me that this is a river because i can't tell that the water actually flows around the right edge of the sand bar. It looks like the sand bar goes all the way to the other bank to me.

I hate to mention this one because it's such an integral part of your image, but i don't think i'm familiar with a landscape where there were only trees on the river bank. With the periodic rise and fall of the river level trees might not survive so close to the water. Also, my mind asks "why aren't there any trees anywhere else? Is it all cattle grazing land?" Then again, it could just be my lack of exposure to such locations.

The reddish tint on the bottom of the clouds looks unnatural to me.

The bright green on the furthest terrains doesn't look natural to me, either. You might create another mat for them with a toned down green. Being so far away, it could possibly pass for trees.

As i said earlier, i like your image. I like the feelings it evokes in me. I think you're doing a great job. And feel free to be just as critical of my WIPs if i ever come up with one that's good enough to even ask for help on. ;o)