Hi, tailhook77!
Online art auctions seem to be pretty busy with business.
Online Art Auction - Google Search
Then, there's also the possibility of using a auctioneer around where you live who might have a specialty in art.
Lots of times, when works of art are auctioned off, they stand a better chance of fetching a better price because people are competing to purchase them, especially, if it's the work of someone notable and who might be famous.
The potential monetary value of what you have could be in the hundreds of dollars up to that which is in four-figures.
Thanks!