Usually, people who draw pictures have copyright (China's copyright law stipulates that they can enjoy copyright without registration for 50 years before and after the author's death), but the pictures you download from the Internet do not know the source and author, and if they are used for trademarks or other commercial purposes, they are likely to be infringed. Therefore, it is recommended to refer to the creativity of offline pictures. If you want to use them, you'd better modify them before using them. If you can find the author, spend some money to buy it first, so as not to overcharge after the trademark becomes famous.