What's the difference between the time of writing calligraphy and painting and nomination or not?

Inscriptions in calligraphy and painting have little to do with authors and recipients. A complete signature is a format, and it also conforms to the specification that there is only a seal but no book payment. It is called "seal" in the creation of calligraphy and painting. Of course, if you want to write an inscription and the other person is your friend, you can clearly say that the other person will definitely not refuse, and there is no need to be suspicious afterwards. I guess your friend is not a famous artist, so you will want to sign it. If you are a famous artist, many people don't want the author to write an inscription (that is, give it to XXX), because once the inscription is written, if you want to sell this work one day, the price will be discounted.