Unfortunately, your composition is not very good - it's 'just a snapshot' of some sheep grazing. Also, the white bits are burnt out - the top of the sheep's wool. And the picture is a bit too yellow, but I think the composition is the main issue here.
Another thing to consider is that this looks like it was taken with a smartphone - according to your metadata, so smartphone pictures don't do so well for stock images. Smartphone pictures don't enlarge so well.