The first step is that the three cartoon images you designed have copyright since the creation of the work. If you have not published it publicly, it is best to register the copyright. Although the copyright comes with the creation of the work. Yes, but if you have not disclosed or registered it, if it is stolen or plagiarized by others, it will be difficult for you to produce favorable evidence to prove that you created it. Nowadays, the cost of copyright registration is not high, and you can register it at the local copyright bureau. The second step is to consider the possible commercial value of this cartoon image. You can register these three cartoon images as trademarks, such as children's toys, stationery, clothing, food, etc. The cost of each trademark is around 2,000. Registering one or a certain category obviously does not provide comprehensive protection, so you have to weigh the pros and cons yourself. The third step is appearance design. Appearance design is specific to the product. You can apply for appearance design for the dolls made of these three cartoon characters. My suggestion is that you do the first step as soon as possible. If the economy allows, you can also consider the second step. Wait until the product comes out for the third step. If someone wants to buy and use these cartoon characters of yours, , when signing an agreement, be sure to clearly state the ownership, rights and obligations of copyright, trademark rights, and patent rights. It is best to hire a professional agency to do it