But now more and more people use simplified Chinese characters in calligraphy works, especially hard-pen calligraphy works. Here, there are different opinions and no one can agree.
Can simplified characters be used in calligraphy works? Nothing more than personal preference! The most important thing is to unify complexity and simplification. Calligraphy works with simplified characters cannot have traditional characters, and calligraphy works with traditional characters cannot have simplified characters, otherwise it will be ridiculous!
Also, when participating in the calligraphy competition, it is recommended to use traditional Chinese characters. Usually I don't pay much attention to my own creation.