no, it wouldn't I mixed finishes in all my baths..looks pretty natural. I don't even think people notice..they just see bigger picture. Don't mix brushed nickel and polished nickel, or chrome and nickel, these are too close to mix successfuly. ORB is different enough from brushed nickel, and also gives that very neutral feel, it being dark..you should be fine. but you can also cross post your question in Home Decorating forum..there's usually where questions about colors etc. go. Or Bathrooms one..but Home Decorating has more traffic..you 'll get more responces

I Agree with Chispa, placing a semi-flush at the center of the powder room will give you a great amount of light. These are some good options. the warda semi-flush comes in four finishes and three sizes https://www.douniahome.com/collections/semi-flush-mount-ceiling-lights this is also a nice geometric option it comes in four finishes and three sizes https://www.douniahome.com/collections/semi-flush-mount-ceiling-lights/products/ula-semi-flush-mount-light

Thank you Comoelita. Do you have a source for the first and third picture you posted?

First, here's a "hi hat" light, like you might find in a school gymnasium: As it appears now, you are borrowing both the Foyer light and Hall light as your main sources of Living Room lighting (I do see a reading light over the chair though). If you'd like recessed (aka "can," or "pot") lighting for a general sustained illumination across the whole room instead of table/floor lamps, that is an option if you like that. You can leave the chandelier in the Foyer if you desire the decor function a chandelier gives at a "formal" guest entry. Just use it only when needed for circulation on the stair. Or, you can put recessed lights there instead. You can put a recessed light in the hall just for hall circulation if you want. In the hall you shouldn't have a problem fitting a remodel can, certainly a wafer light, in between the attic access panel and return grille.