Nice job. Think about making up a brochure and hand delivering it along with with your sample report to local vets. My vet was pretty excited when I showed her some sample photos and offered to keep brochures in the office.
Horses make interesting subjects, because the source of the problem is often not where it appears to be. I did a scan of a lame horse last year that the owner thought was having a problem in the stifle, however the scan showed a point of inflamation much higher on the hind quarter.