Lighting on the side of the face is often a better choice, if you're able. It cast less shadows; easier to put makeup on by. If you put a 2 light fixture above each mirror it probably would be enough, depending on the wattage it can take. I have a sconce on either side of my 21x33 oval mirror, a bit smaller than yours. It is enough lighting. I use 100 watt bulbs in them and I can dim them. My over all size of my bathroom is 6.5x9.5 and lots of light colors & reflective tile surfaces. These 2 lights are all I use for lighting. If I had darker materials in there I might need more lighting than this. I face mine up so I don't have to look at the bulb. I think the 2 vs 3 would be a personal style issue. What looks better. I think either would work. You could do a search on Houzz and look at all kinds of sconce pictures.

Nice sconces! We have 4x40w bulbs, 2 each in two sconces, in our small master ensuite. It's adequate but barely, partly because I find the glass a little too thick and it dims the bulbs quite a bit. I'm waiting for them to die so I can put in slightly brighter LEDs. I would think it WOULD be adequate for a powder room -- guests don't need to see every pore and cat hair on the floor. In my 5x5 powder I have 2 60s in an overhead fixture and it's pretty darn bright. Especially since I replaced the charcoal grey fixtures with white ones. This post was edited by robotropolis on Tue, Nov 5, 13 at 11:03

DH has the same set up in his bathroom that we're remodeling. I have the 3-light fixture but not the mirror yet. It will be 32" wide. Vanity is 36" but against a wall on one side and we don't want the framed mirror butted up against the wall. I was a bit surprised that the globes were as large as they are. I think the 3 lights will look better. I just hope they aren't unproportionally too large. http://media.bellacor.com.edgesuite.net/images/500/29515021AZ3.jpg

I would suggest you place your task lighting above the cabinet edges. Ideal Location for Recessed Cans I believe there’s considerable misinformation about where can lights should be located in relation to countertops. In a couple of books used by kitchen designers, I’ve seen illustrations showing recessed can placement well away from the task. The illustrations don’t include dimensions, but out of curiosity I traced and enlarged them, then scaled them using the 25-inch countertop as a guide. In doing so, I found that one illustration shows the cans 49 inches out from the wall and another shows the cans a whopping 56 inches out. This spec seems to have originated in a kitchen lighting book that was popular in the ’90s. The book’s theory was that lights centered in walkways wouldn’t create “hot spots” on the upper cabinets and that under-cabinet lights would do the heavy lifting (see “Under-Cabinet Lights Won’t Save You,” below). I bought that book, but the advice in there to center the cans in the aisles made no sense to me, and I stopped following its guidelines after one or two projects. But it has bothered me that this bad advice is still being disseminated. Then, a few years ago, I met with a prospective client who complained of really bad lighting in his newly redone kitchen. This launched me on the path of putting numbers to good and bad lighting. Now I measure, before and after, every kitchen I’m asked to redesign. You can’t manage what you don’t measure. My opinion, based on common sense—and now also on empirical evidence—is that the proper place for can lights intended for task lighting is directly over the edge of the countertop, which is roughly 24 inches out from the wall. This location puts the beam right above the work surface and, equally important, it prevents the cook’s body from blocking the light when he or she stands at the counter working. It also throws light directly into open drawers. From a good read I found here https://www.proremodeler.com/recessed-kitchen-lighting-reconsidered