I can't comment on the size of the light fixtures for the peninsula, but I do like your choice. In my kitchen I have 3 different kinds of light fixtures - one over the table, another one over the kitchen sink and then 2 the same over one window and the back door. Pot lights elsewhere. Personally I like the different fixtures - not too matchy matchy - but maybe it is not for everyone. They all have something in common though - the metal in them is antique brass.

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

This article gives various suggestions for how to remove the logo or other printing from the base of a light bulb. Knowing you can remove the printing could widen your search results! www.houzz.com/discussions/2668497/removing-printing-from-the-end-of-light-bulbs