And fineness. Whether it's damaged or repaired.
2. Look carefully at the author's style of painting and writing.
3. Analyze the time and background of the author's creation.
From the painting, we can know the author's personality and the significance of the times.
The aesthetic feeling of art is value, and selling it is a price. What is valuable is not necessarily expensive, and what is expensive is not necessarily valuable. This is an economic concept.
Appreciating calligraphy is unprincipled, because a good work is simply a word: beauty! So how to appreciate beauty? That's the truth.
As long as you have certain artistic appreciation ability, you can see what a work is like, and of course, at least let the people accept it. However, there is still a problem that the contemporary public's art appreciation ability is far less than that of the ancients. Some of them are in our nature, but the cultural atmosphere is gone. This is a great cultural phenomenon. It's a long story.
Give you a standard: if you look at Wang Xizhi's writing and find it beautiful, then you have the ability to appreciate it, feel it is average and your ability is average.