The Tribute Horse

Its called The Tribute Horse! My mom has had it hanging on the wall since i can remember! its very big, i believe its oreiental on the back has a paper about the history of the event taking place in the photo! something about an emperor T'ang and the flight of the T'ang! I cant find anything about this landscape art the paper on the back says the artist is lost to history??? It is a little dirty but the paper talks about the dark bronze and gold colors represent the courtly sung style. The paper also talks about this art is part of a scroll the was probably incomplete!