Lighting a bathroom is not an art, it's a science. The basic rules are set out in our article, Bathroom Mistakes That Owners Regret. See the section on lighting.

Rambling thoughts:

- Do not remove crown molding! It adds a bit of finish /polish /sophistication to any room.

- Removing the wall sounds like a good idea. Divisions in bathrooms are rarely a positive, but I'm confused: Could you draw a sketch of the room? I think you have a moderate-sized vanity /sink in the outer space, then a small vanity, toilet and tub or shower in the larger area -- but If I have the right idea, then I absolutely support the idea of making it into one large space. And 9 1/2' isn't all that large.

- Yes to a larger vanity, but you're not talking about duplicate sinks in the 30" vanities are you? Duplicate sinks are not a positive -- especially in a modest space, more storage is more important. By far. Aside from the vanity, I don't see any storage in the bathroom -- so it needs to be ready to absorb towels, toiletries and everything else a bathroom holds.

- So the toilet next to the vanity is typical, and it allows you to place a trash can between the two /it can be used at the toilet OR at the sink.

- Are you sure about the 8" backsplash? People have moved away from them, as they serve no purpose /chop the wall space up visually.

- Where are the faucets? On the 8" backsplash? Behind the sink? To the side of the sink? Definitely go with a one-stem faucet OR a wide-spread set -- those choices are easier to clean that the most typical 4" set.

- What I prefer /see as most practical: One large plate mirror -- but frame it. Just as crown molding improves all rooms, framing a bathroom mirror takes the room "up a notch". The mirror probably won't go to the ceiling -- a 3' mirror would probably work best for your space, as that'd give you 3' of cabinetry, 3' of mirror, then 2' above the mirror for a light shining down on the sink. You could also (or instead of) add pendant lighting to the sides of the sink; they'd double their light in the mirror, so putting them on a dimmer would be a good idea.

- I would not go with multiple small mirrors. It just chops up the space, while giving you less reflection.

I have an 83" vanity - there is no way I could have fit three separate mirrors. I have two mirrors + three sconces (on outer side of each mirror + one between).

I used graph paper to sketch out my wall + vanity + exact locations of each mirror + sconce. If you aren't willing to put the time in to make a sketch, I'd go with one mirror because it won't be as difficult to figure out - you can add three sconces through the mirror evenly spaced (your example photo with four sconces is longer than your vanity will be).

Sconces need to be installed at a specific height - if the person/people using the room are tall or short, then it can be adjusted. I can't remember off the top of my head the height I installed my sconces - I think 66" - but it also depends on the sconces.

can you show a design of how the vanity will look?

is that wall getting removed?

this almost sounds like what you want to do w/two vanities:

these are pretty long

two smaller vanities jointed together by an open shelf middle

for the single:

just do a nice framed mirror of some type, and a 3-4 light over the top.

How can we answer we do not have enough info or a to scale plan. No idea of your style and is the crown everywhere else in the home ?I am in minority here but I do not like sconcesfor bthroom lighting I much prefer good LED bath bars above mirrors I also do not like 3 mirrors on a 8' wall a nice wall of mirror would be a nicer but I have no clue as to the space or your style Having a counter different height for make up is never good all you need is an adjustable stool for makeup . IMO bathrooms like kitchens need awesome lighting so LED 4000K is my choice you can go 3500K but any lower tnad yellow cast happens . If you really want help post a to scale floor plan of the whole space empty . then see what is possible even for layout if plumbing can be moved .