Personally I have no issue, and even enjoy mixed fixtures, but not in different color families. Your ORB is a warm finish and the nickel is cold. I mixed old gold with ORB and it flows wonderfully, but the nickel flusher stood out like an ugly thumb (IMO) so I changed that out quickly. So my answer, never with those two finishes. People love many things, which does make them work for their space, but not necessarily for everyone. If you are never going to sell...than don't worry, or if you don't mind changing them out...but if you can change it, I'd go with the same body of color (warm or cold) verses trying to make the two work together...cuz they really don't :(

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

Shrina, the color is fine.(Although Polar White is a cool white w/more of a blue undertone. Since you have the brown tiles, I might have gone w/a warmer white. But you can work around it) once you get the mirror framed out, it will start to take shape. (maybe do a warm wood frame?) Add some cool hardware to your vanity. (maybe something w/decorative knobs) You don't want to paint the vanity? What you need is life on that large, blank wall! you could also do a shelf or two above the toilet to add a few accessories. here are some examples and all of them would perk up your space. do some inexpensive wood shelves. have some wood cut at Home depot, sand and stain them. get the brackets there too. (you can spray paint them silver, gold, white, whatever) then bring in some warm elements like the baskets, rolled towels, etc IF you paint your vanity white (or another color) it will revive the entire look ideas for the back wall,,,, this one you can cut a piece of peel and stick wallpaper, frame it, paint the frame, and voila! While on this one below, they did the entire wall. (you could do the peel and stick, regular wallpaper, or a mural). maybe some glass shelves over the toilet w/a picture or something. paint it a bold color (the one wall) and do some photography art or do a few picture shelves bold color, focal accessory (here they used a map, but any large picture or two would work) but look at the other items in the room. the rolled towels, a basket, nice rug, etc maybe a few pictures you can do something like this w/faux succulents. so a few shiplap boards, paint a darker color above it, add art or shelving and if you want to go full out, paint your vanity, add some wainscot around the bottom (you can DIY this) and whatever else you like get yourself a better vanity tray RL,4000K is hardly hospital-like. it's natural light. 2700 is really dim and really yellow. I think the lighting is fine. The glaring cool white walls are making it brighter. any reason why you picked white for the walls w/all of your brown/creamy tones?

That looks like Mica company, and it looks like you remove the screws around the outside.