I have made price which I think best. Because It's taken my three days to be prepared.
10 eth? Good luck with that, however you have an anon account in opensea, there's no link to your other art to even start to valuate your work. Right now you are outsider art and while that has market, it has way more artists too.
3 days isn't unusual for painting to be finished. But it would be unusual to pay for 10k per day to unknown painter.
I know a lot of painters / artists that are using weeks or months to finish their paintings.
Even a famous artist would find it difficult to sell these art piece for 10 eth, so how come an unknown person could sell the painting at so high prices. But in an NFT world, everything is possible. Who knows, one days these get sold at 10 eth price and it become an headline.
OP, if your NFT got sold, update us here.