tbh there aint much shortcuts to brushing reflections, and you cant have the same opacity and settings on everything... i usually brush very messy and flat first, then i start to add bright reflections like sky, lights, oftenly ground refs who are bright, and always remember that in outdoor enviroments the horizonline is really important since above it it usually is brighter exept when you do night pics, and a thing alot of people dont know/ ignore is that the reflections have vanishing points, just like the enviroment around the car. and a car with bad lighting just look awful, and one more thing with brushing is that all surfaces dont look shiny, some look a bit flat eventhough the paint is shiny, like where the light strike the most, and where the reflections dont have to much details, so basicly when you´re about to create your refs you just remember that it oftenly need some flat(ish) surfaces, the reflections get smaller the further in they go, and try to use reference pics as much as you can when starting with it, its the easiest way to go
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