I have a picture of an Indian on his horse carrying his Spear with there heads hung low looking as if they are tired or sad. The horse is standing on top of a high rocky mountain as the sun is setting. The picture is from 1925 Borin mfg.co.Chicago. What is the value of this picture, painting, drawing etc?

This picture was given to me by a good friend who was at the time 90 years old. That was around 4 or 5 years ago.