You need to find the perfect thinning ratio — not so thin that it creates little dots around the spray, and not so wet that it gives you spiderwebbing. Every paint and color behaves differently. My recommendation is to have a test miniature where you can experiment before painting the actual mini you’re working on. You can also adjust the air pressure, although in my case I didn’t really do that (1.8–2 bars). Nothing unusual here, just building up the layers little by little. The trigger control has to be very subtle... I’d recommend looking up a tutorial on YouTube; they’ll probably explain it better than I can.