Sand paintings used to be very popular. A Navajo medicine man will make make a sand painting during a ceremony on the ground and it will be destroyed after the ceremony. A sand painting like this is very different from a ceremonial one. It is a beautiful piece but I can’t imagine a value like $7k. Not framed you would think to see this around $100. I did a google search Native American Fine Art: Navajo Sandpainting Signed and found this painting for sale. You might compare sizes? The subject is more of what you would think a ceremony piece would include.