This is a really simple way to add some "glow" to renders in studio without post work.
First your going to want to open a template or base texture for the character you want to add your pattern to. If you use the texture be sure to make a copy of it and close the original so nothing happens to it.
Then on top of the template or texture you're going to add two layers. The one directly above the template will be flood filled with black. You can turn this one off until time to make your final image.