In the appraisal category, we do art as well as antiques. We can do art if we can find the artist who has signed the piece, we can give a value of what something would sell for as unknown artist if the artist does not have work sold in the past 12months or so, or their sold work has not been recorded. We use art data bases, as well as have access to past auctions and some gallery's sold prices. We cannot appraise art, in other words value a painting for what it is, since we cannot see it in person to see all the different aspects of what it is, in style, composition etc.
We also appraise antiques, give values of what they are valued at on today's market.
Appraisers answer questions for the customer once that question is answered the customer rates it and the appraiser is compensated by the site. Then the customer can ask another question , and so on.
I will be happy to help you if you send a picture of one of your pieces as well as a close up of the signature if there is one.