Is it infringement to copy other people's paintings and publish them?

As long as you show that it is a plagiarized work, it is best to introduce the original author, which is not infringement, because you have not used it for commercial purposes. Also, under normal circumstances, it is less likely that the copied works of celebrities will be infringed by the defendant, because everyone knows who painted them. I'm afraid the works of second-rate and third-rate painters don't get much attention. Once you have copied it, if it involves commercial interests, people will definitely sue you. Generally speaking, plagiarism is not infringement, just boldly send it to your blog and space.