How Do I Find Out How Much A Portrait Is Worth I Have Vinyl Portrait Dolls Scarlett And Josephine With 15 Ensembles. How Can I Find What They Are Worth?

I have vinyl portrait dolls Scarlett and Josephine with 15 ensembles. How can I find what they are worth? - how do i find out how much a portrait is worth

I looked around Ebay / Franklin Mint and can not find at least half the sets of costumes. I sell everything, but we know very little about them and do not have much help from eBay. All sets are in original boxes and 10 has been opened before. The dolls have their boxes. He is somebody who can point me in the right direction?