I don't like the yellow tone light some bulbs throw off. My condo is modern and I used bright white led bulbs and the difference is amazing! Maybe try that before redoing anything? Honestly, they bring in tons of light but still have a frosted outside appearance so they don't blind you. It really gives my place a clean, fresh look.

I think you might find that brighter LED lights will provide enough light on their own. Adding sconces, along with the two upper lights, would be too many fixtures in your space, I think. If you just had one upper fixture, it might work, but four fixtures is too many.

Since you love your existing lights, what about, if the new bulbs don't fix the problem, putting in a larger mirror (I think you could use a larger one there, which will also reflect more light) and back-lighting it for more light down low?

these are more sconce style but I think mounting yours high with mirror behind them would work

keep your lights and get the backlit mirror(or the LED strip around the edges) like Olychick posted. that's all you'll need. Bonus, those backlit mirrors are great for doing makeup and hair.

yes your lights need to be lowered.

you could prob do something like this if you want sconces. they'd have to be thinner. and you'd have to do something similar atop the mirror.

The mirror is several inches too high, especially if you're 5'2". Bring it down as well as the lights.