We have artwork as well and through the years have looked to see how much they are. Believe it or not, unless you have an incredibly rare piece, you can find examples on
Art Brokerage - Buy and Sell Fine Art - Art Dealers and Artwork for Sale and eBay. We were fortunate to sell one of our pieces at the original gallery in Newport Beach for 50% of the price. Very established artist. Do not be surprised if you see those sort of numbers.
Also, if on eBay, look at advanced search and add sold as a filter, anyone can ask whatever they want, but what sold is all that matters for confirmation of value. Most paintings (for example that folk buy at Park West Gallery on cruise ships) etc fall substantially. Not uncommon to see paintings valued at 25% of what they were sold for. Just like glass art, Lalique, lladro, there isn’t a demand. We gave some of our Lladro away vs the shipping concerns of breaking for the small amount we would have made.