When you submit to a stock agency, the images have to be tack sharp or they won't even accept them. Try shooting the image again and make sure it is sharp and then you never know.
Which camera and lens was this shot with? I feel the scanner maybe didn't do the picture justice and is part to blame for the fuzziness...., but none of it looks particularly in focus to be honest.
As said above, Stock pictures have to be perfect. I'm sure you can succeed