Only the transition of the skies seems a bit (A BIT), where I'd advise the darkness to ebb in a little like mist in the skies (from below) and to make the transition a bit longer.

The ground is good though, with the lighting and the transition is great too.

I think the details are great, and good job on the water.

But what is that odd shade to the right of the house, above the river in the background of the sky? (under the foilage of the trees?)

Maybe a slight change with the lighting of the windows? The light seems unnaturally bright in comparison with its surroundings. I'd think this kind of brightness would fit better if the sky were even darker, but maybe that's just my opinion.

I think you've done a great job, and its cool that you've put a slight cartoonish effect in it.

Good luck on the rest!