1, the popularity, influence and reputation of the creator;
2. The stock of the creator's calligraphy works is more and more worthless;
3. The third is to look at the artistry of the work itself, the artistic level and value of the reaction.
Judging from your question, I searched the profile of this role. At present, the figure's popularity and influence are acceptable, but because he is still young, he will create more calligraphy works in the future, which means that there are too many works in stock and their value is not so great. Judging from this picture, the creative skills of the work itself are also good.
To sum up, the value is between 5000 and 10000.