There is no definite answer to that. I've seen pictures where it looks great and pictures where it looks hideous. It depends on how different they are from one another, how big is the space (as in, a faucet in a tiny condo bathroom with a bronze light inches away from it will be way worse than in a large bathroom with more breathing room between them), and whether both of them go with other elements in the bathroom. If everything, like towel bars etc. is chrome and then there is one single bronze thing, it will look like an oversight.