I have found value from a couple of galleries of his oil paintings however have been unable to find an estimated value of his etching watercolors. I have two. One is artist's proof pencil signed by artist w/ name of painting and the other is #5 Paris Etching Society w/o copyright date also signed and named by the artist. I would like an estimated value for insurance purposes. Does anyone know an inexpensive way to have them appraised for insurance purposes? Oklahoma