60 watt or LED equivalent is not enough and down light from recess cans is stark. My suggestion is build a frame of flat 2x 6" shorter and narrower than the mirror your going to use. Cover it with 1/2" plywood. Run LED strip lights (see site) on the outside edge of the 2 x frame facing out. Run your low voltage supply to the lights and set the transformer on the back wall of the vanity where you have added a duplex. This will float the mirror and give your uniform reflective light for make up and such.

http://www.environmentallights.com/led-rope-and-strip-lights/led-strip-lights/single-color-led-strip-lights.html

I like them facing up and a little lower.

Facing up is better than down. It still is not enough lumins to properly light a face for make up or shaving.

A good rule of thumb when hanging a wall sconce is to have the middle of the fixture sit 60 inches above the floor. Every scenario is different and when hanging a wall scone, it is important to find a level that will allow the majority of the people in the particular space to enjoy the lighting from their normal positions, without suffering from the glare of an exposed bulb. If the room is used generally for sitting like a dining room, then it is best to place the sconce at a position whereby the majority of people sitting in that room cannot see the light source (bulbs) and suffer from glare. It is always important to place it comfortable as it relates to your eye level.