It is a very large bathroom, and while there are other lights in the bathroom--the ceiling fan/light/heat combo in the shower and 2 6" can lights, one over the door and one over the make-up vanity, and the vanity lights--I don't think these lights will provide sufficient task lighting for my SO to shave at the sink, so I'd also like to put in 2 can lights over the sinks.

I'm thinking I would like the cans over the sinks to be 4" so they are less obtrusive and don't take away from the sconces. But the ceiling in the bathroom is vaulted. It's about 10' over his sink and about 8-3/4' over my sink.

So my question, finally: Because they'd be so high, would 4" can lights be functional in this space and provide sufficient light, or should I go with the 6" can lights?

Thank you!

The order of preferecne is:
Lighting completly surrounding the face. (a makeup mirror)
Sconces at face level on each side of a face.
Sconce centered over face.
Multiple cans so light can wash down sides of face.

When you see sconces accompanied by a recessed fixture over the sink, the recessed fixture's main job is to light the beautiful sink and faucet, not your face as it creates shadows under eyebrows, nose, chin.