Oh, I love the idea of this painting!
The sky is so brilliant, and you really understand clouds!
If there was anything that could be improved, it would probably be the tree silhouettes-- I don't take much issue with them, but I do think it would be more realistic if they overlapped and waned in places-- if they variated in their grouping.
Have a clump of trees and then an empty space for a while.
That is, however, a minor detail, as everything else is beautiful.