Iâ€™m not a moderator, so this is just a guess.
Your posts contained hypertext. Now I know that they were just pictures of your artworks, but they could easily be seen as spam, especially if youâ€™re a new poster.
Instead of posting hypertext post the image instead, you should be OK.
Having said that youâ€™re not likely to find a satisfactory answer. People who deal in Art are very jealous of their knowledge. There are websites where you can pay a fee to access the prices that various art pieces have gone for over the last few years.
And thatâ€™s the only way youâ€™re likely to find out, and itâ€™s not cheap. The costs are prohibitive that unless youâ€™re in the business thereâ€™s no point paying.
The cheapest Iâ€™ve seen was about Â£1000.
Unless you think your paintings are worth more than that thereâ€™s no point.
Sorry to be the bearer of bad news, but Iâ€™ve had problems valuing some of my pieces.
Youâ€™re best bet would be to make friends with the owner of a local art gallery and pick their brains.