Only picture of a black headlight housing I have on my computer is before they were even put in, haha. (And a crappy quality one from my old phone.) I like flat black on my SWP, I think gloss black would look odd, but that's just me.
For the yellows in the lights...eh I don't really like it, I don't like it looks on that BMW either. It's not that it looks bad, but it could look better :P Although once again, that's just me.
I'll try to get some actually on the car later, if you need more comparisons.