My father does this to me all the time with his woodcarving. I give him an honest opinion, because that is what he wants. I didn't take art as a major in H.S. for nothin', hehehe.
Water: looks like a beach, not a river.
Frame: the inner ones are hard, the outer is soft. They clash.
Birds: ditto to what Faerilee said.
Shadow: you picked up on the sun and shadow. But the tree is the only thing that has a shadow. The lion and rock should also have a shadow. Especially since you can see the light side of the lion faces the sun.
The further back things are, the softer they are. The detail should not show up. And you don't really need the reeds in the front.
Contest? How about just a place to get honest opinions. If you don't want 'em, don't put something there.
Ain't ya glad I showed up? You can ban me now.