What does hardcore painting style mean?

Hard core, as an online buzzword, originally meant to describe rap music and games. So hardcore rap and hardcore games have long been said. Hard core rap is a more powerful form of music, passionate and violent. But hardcore games are difficult and have a specific audience. As a popular network language, the word "hardcore" is used in a wider range, not only to describe rap and games, but also to be understood as very powerful, cool, tough and rigid. In the same way, it is a cool and tough painting style, and the common beauty is many hard-core painting styles. I hope this answer is helpful to you.