That looks good mate, two of my mates at work have both painted their calipers. One did it with a brush, with the caliper off but the carrier on. The other did it without taking anything off, just masked everything off. Scirroco tsi and a mk4 gti. Not what I would do, but they both look good. Either way, I'm saying that having done yours properly, I'm sure itll look ace, two coats or three coats.