Do you want to paint on fake bricks or do you want to paint something so it looks like brick?
Where is the fake brick? Inside, outside?
Here's what we did with our fake brick panels to make them look more real:
Here's how I did it: https://www.unexpectedelegance.com/diy-brick-wall/
Here's my tutorial but I ended up using joint compound instead: https://withinthegrove.com/how-to-diy-faux-brick-wall/