Is Yu's calligraphy and painting valuable?

It's not a question of value. Presumably, the above artists have never seen the teacher's work. Don't generalize all artists, whether it is hype or strength. People's eyes can see it. Everyone has instinctive artistic judgment, so don't always think about valuable problems. I have seen Mr. Yu's works and appreciate them. He is a veritable artist who does not hype, and he is also a very respectable good friend of Wei. I've never seen him have anything to do with hype. Not all artists make a living by hype.