>>10950691>>10950659The tl;dr of your problem is that you haven't cleaned the airbrush as well as you think. That's why I think it's stupid to start with this sort of equipment because you have to be new to not realize it.
Basically the actual nozzle, part 3 in the exploded diagram, is full of gunk. You need to leave it in airbrush cleaning solution of whatever paint you have used. It's typical that because water is thinner than paint it'll come through the hole while paint won't. It also matches that you need to "shoot" paint by moving the needle - paint is being forced through by the needle like a plunger, not drawn through the nozzle by the air. Usually what causes this bit to get clogged is the hole in part 2 being not perfectly clean either, so check that too.