There is a correct way to practice calligraphy, and the wrong way is the opposite.
Chinese calligraphy is composed of brushwork, structure and verve. The handwriting you say is stingy, and it should be that the brushwork is not in place (that is, the Eight-character Method of Yong)
You can ask for details about how to practice it (the store knows calligraphy and pens very well)
Search for "hand-polished pens" as shown in the figure
Here are his handwriting: