Outstanding work Marcin, I love the framing of this one! It is lovely balanced with the 2 trees on each side creating a very balanced view of the picture. What adds even more to this balanced but yet strong view is the contrast different of them, the left one is dark yet the right one is brighter as if it was the bad and the good, the Yin and the Yang! I really liked the concept (and maybe I would also give this title to the picture! ).
The sky is stunning and the cloud movement from the slow shutter just add to it, the lines created by it and the feeling of them moving just draws you inside the picture.
the lower part (grass) is also pleasing and well captured. I prefer the slow shutter version that a sharper one, since it would just add to much information in it and I would not be concentrating in the main subject.