It's an okay concept, but the sepia tone isn't all that effective here. Also, you could try cropping off some of the empty space on the right, maybe about a third of it.
I like the shape you have chosen for your crop, it suits the environment. I don't mind the dog looking outside of the frame, it suggests he is about to find the ball. I think this photo might be stronger without the monotone, as it could give the scene a little more interest.
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