If you are good at sketching, you can post your works on social platforms such as Weibo first, and after gaining popularity, someone will try to find you to take orders. This kind of work is mainly based on the conceptual design of the characters in the game, the background design of the map, or the propaganda map. The requirements for painters are very high. In order to prevent the manuscript from being cheated, it is generally to collect the deposit first, and then don't give the HD picture and PS original picture to the other party for free.
If you are just an amateur with the ability to sketch, you can try to go to some drawing forums of artists' union, where many comic studios recruit line drawing assistants and coloring assistants. I don't know coloring. Generally, there is one line drawing assistant in 20 yuan, not less than 200 square meters a month. I wonder if I have the level of a line drawing assistant. You can go to Baidu pictures and search for "comic line draft" to see if it can meet the standard.
If you are a painter who is good at using pen and paper and oil painting, if you are confident, you can open your own Taobao shop to draw characters. Or open your own studio to teach children (this requires a certain amount of capital investment, but it can also be done in your own home)
If you have to, you can go to platforms such as Pig Bajie. Com, but the platform will draw it, and Party A may cheat the draft.