Original Crown & Esso Billboard Art

I was given these a while back by the artist. He is a family friend. I showed in interest in them and he said I could have them. Does anyone out there know if there is a demand for this sort of thing? I would like more information on them. These are the original submitted works that were ultimately used for the billboards as seen in the photos. The ESSO is a drawing but I don't know if it was ever used.

Thanks in advance for any information.