Very good scene. The background mountain is near photo realistic!
I like the birds, they look right.
Even the grasses are not too bad, except maybe that the single, tall grass instances looks wrong there.
Overall, I like the render a lot. It could also be a good basis for some further scene development, with additional objects maybe. A ladder up the tree and a bench and table, or an old hut in the farer midground..
Cheers,
Frank