Wlademir, you definitely got a mood working in this. Very moody indeed.
A couple of thoughts for you.
1st, I think I might brighten the water some. The blacks and dark of the sky looks moody, but in the water it ends up looking more muddy and it pulls a bit of life out of the image.
2nd, I don't think it can be cropped out now, but when composing I would keep an out of sandy bare area's in the ground layer. Myself, I would have composed this one to not have included that sandy area in the lower right. I would have moved a bit so that I could have gotten flowers in that whole lower corner.