@sivan Overall the scene looks nice.
But either the shadows are too dark, or the trees could use more contrast.

I would try 2 things:
either increase the transparence of the shadow blobs and make them even more blurred.

Or try to alter the trees, in a way that the leave-patches
are darker at the bottom and inside.
And lighter on the outside.
This makes the trees have more contrast.
(outside shiny, inside more shadowy)

And the trunk of the tree should also be darker than
the leaves, especially in the middle where the leaves are dense.