I’ve chosen one of the lower back tattoos for female Sims. This makes sure everyone can use the item if you choose to upload it. Always make sure the item you select is base game whenever possible. Use the filters at the top to filter for base game tattoos. Since we are making a custom tattoo, we will want to select a tattoo to replace. Next, select the CAS piece you want to replace with your tattoo. Make sure Create CAS Standalone is selected in the menu and click the CAS button above it.
To start with, open up Sims 4 Studio and enter your Creator Name.
I will not be showing you how to use your photo editing software, since every program is different.