As museum policy, we are unable to ascribe a value to your photograph. You might  want to look at auction results online to see if other, similar photographs have sold at auction recently.

I agree that this is a very interesting horse -- amazing degree of realism. In addition to the fact that the original color of the bronze (it was constructed from 9 separately cast sections) is visible on parts of the horse, the traces of paint--black, red, and white--around the eyes, mouth, neck, mane, and belly contribute to its realistic appearance. It looks so alive!