Hi Andy - it's a very pleasing shot which IMO has good composition, except for the tree, the horse is walking into the shot (always good) and there is a focal point to catch your eye. The distant buildings give added interest but are so far away so as not to detract from the main subject.
I'm not sure your mono treatment does it justice (Dave will add to this) and it looks rather soft throughout which I don't think sharpening would recover. I would like to know the exif data if possible? Good try, keep going back and re-shoot with different settings (assuming the horse is still there).
