Personal innovation, improvement and practicality have been added to other people's products. Can I apply for a patent?

If it is appearance, it is not a big problem. Utility models and inventions should be creative. Article 2 of the Patent Law stipulates that a utility model, invention or improvement thereof may be patented. It is suggested that the landlord can apply for an invention patent if he feels that his creativity in improving products is obviously outstanding. On the contrary, if the creativity is low, it is better to apply for a patent for utility model. I hope to take my advice, thank you!