Wayfair has the picture of the bathroom with the sconce over the mirror. It doesn't look too small but 13" is about the length of the sink and I'd prefer longer. The 3 light will just about span the mirror. It takes 100W bulbs but you'll probably want to use less lumens because that's six lights. My Duracell are 60W/800 lumens LEDs.
This pic is from Bellacor. They look a little heavy but they're over a small vanity too.
I did a 3D mock-up of lighting by cutting cereal boxes to size. Try that.
Q