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.
But, a popular artist wont get popular in the first place if his artwork are not nice and since his artwork is nice, selling it a much higher price is acceptable and can be sold easily because the artist is famous remember?OP, if your NFT got sold, update us here.
It is always a pleasure for his fans to get something from his idol. Or it can work this way; a famous artist might not sold an art for 10 et. Say he sold his art for 0.01 eth a piece but since he is famous, it will not be hard to market his arts and many people are still going to buy. He can reach 10 eth or more in no time. OP's art takes 3 days for preparation? How about the time spent to do the art? That matters the most, not the preparation time.