What is the most important thing about tattoos in Beijing?

Don't make tattoos so complicated. You can get a tattoo directly if you like. As for the precautions you mentioned, do you mean the price of tattoos or the level of masters? Personally, these two points are one of the important considerations. Only a good master can help tattoo the ideal pattern, but a good master doesn't mean you have to charge a high price, so you need to find a good tattoo shop and tattoo master, like Tamu!