I need to see the space design and I do not like sconce since most provide poor light I much prefer good over head light combined with good bath bar light all in LED 400K if the bathroom is small the bath bars can often be all you need. That sconce you show will IMO cast weird shadows from that textured glass .

I agree with Patricia in most cases, well-placed overhead lighting and bath bar lights with the right color temperature can do the job beautifully without overcomplicating the layout. That sconce you’re considering is lovely on its own I would love to see how the whole design looks like it would help make the best decision.

If you’re concerned about the wall looking bare, maybe add visual interest with a framed mirror. Sometimes less is more when it comes to lighting layers!

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Pendants can also be a nice addition, although like I said I would love to see the design first and what fits best.

The work done does not make sense. The dual over-mirror lights and sconce had drywall patched, yet there are no electrical boxes. All are a whip, but then a hole is bored for an electrical box. The box should have been mounted to studs when the drywall was open, and with that insulation could have been tucked/air sealed to these boxes. If your chosen lights do not need a box, then more patchwork is needed.

For aesthetics, the single sconce in the middle looks a little odd IMO. It's moreso decorative, so it completes with the (no pic provided) over-mirror lights and feels disproportionate to a dual mirror setup. The sconce might be better on another wall to tie in to the vanity lights.