Unfortunately, the options you presented don't really work. You won't like the result. Listen to that little voice in the back of you head. It's trying to tell you something.

Unless you can match the brass finish or gold finish with each of the elements, it just won't work. They will clash. Sorry, but that's the truth of the matter. That's why gold and brass are so hard work with. If you insist on gold or brass, it has to come from the same company. They don't match up when you try to cross companies.

Plumbing fixtures are hard and expensive to replace. This is why polished chrome stays in style year after year. It's just like stainless appliances, they match up regardless of brand. Polished nickel and brushed stainless plumbing fixtures work together, too.

I'm going to suggest being boring and use polished chrome because it matches what is already there. I know you want to lean into the mosaic tile, but mismatched gold or brass with polished chrome won't be successful. Polished chrome for everything is your best choice. Sorry for the bad news.