At risk of sounding like an ass...
That's horrible. Regardless of my personal preferences for the color or not, the work quality is not there. Be it naive or lazy, this is exactly how I would recommend NOT painting calipers. First, with calipers with that kind of age on them, I would recommend nothing short of sandblasting to adequately prepare the surface and make sure it lasts more than a week. Those calipers are going to be subjected to some ridiculous temperatures. Secondly, the caliper and caliper mounting assemblies should be entirely disassembled - pins, bolts, rubber boots, brake pads, hardware kit all removed.
Sorry to be a little harsh, but work like this degrades people's respect for your car and yourself as a car modifier. It is, and looks, half completed. Petting egos only reproduces more work like this - look at what has happened to Hondas. A couple guys taped huge wings to their trunks, threw on eBay bodykits, and no one ever told them how much it sucked, so it encouraged more. Shotty work needs to be weeded out by harsh, constructive criticism.
Good attempt, but it looks like you have your work cut out for you for next time.
- Julia