Here's a quick example of how I use it!
First use the brush however u like it
Then select the layer and extend the selection area

Paint it with a darker colour so it looks like an outline

Then duplicate, I use "multiply" and blur so it looks like a shadow
Enjoy!
First use the brush however u like it

Then select the layer and extend the selection area

Paint it with a darker colour so it looks like an outline

Then duplicate, I use "multiply" and blur so it looks like a shadow

Enjoy!