Hi, it's late here and I am sleepy for a detailed analysis XD, but in my opinion, looking at the hard light on the subjects you need to change the forest background or at least try warm colors, in my opinion looking at the bear if the light comes from the sun thru the window, in a picture, you probably mostly just see a bright white light coming from it.
Another thing would be the hole in the wall where the elephant is, the light would come from that one as well...
The contours of the wall hole need some work, with the bright sunlight, in my opinion, it shouldn't have almost any black zones, depending on the zones, would be from white to grey.
That elephant would cast a shadow on the watermelon and (floor maybe) XD.
Cheers!