Are these crape myrtle shapes reasonable? What are the problems?

Unreasonable, the branches are too long, the buds are few, and the whole crown looks messy.

"About 10 days before autumn, cut off the flower branches of that year, leaving only 2 ~ 3 bud points at the base of the flower branches, forcing them to send new flower branches again. This method is best combined with loosening soil and fertilization management. In addition, we must ensure that plants can grow in a well-ventilated and sunny environment, otherwise it may be counterproductive. "

See Baidu for the construction method.