It looks like you fell into the 'all too common' trap of using two light.
Two YN 560s left and right at 45* shot into reflective silver umbrellas
You end up with very flat lighting, which is 'nice and safe'...but it's also boring compared to what you could do by only using one light.
Portraits are all about light vs shadow. What parts of the face are 'lit' and what parts are in shadow. What is the difference (in brightness) between the lit side and the shadow side. Those are the main concerns when you are thinking about portrait lighting.
As usual, Derrel has given some good advice. I'll echo that using one light would give you a more interesting photo (with 'better' lighting).
One of the best bits of advice for the budding studio photographer is to 'turn off the fill light'...at least until you really see it's purpose.
So, start with one light in front at 45 degrees. This is your main light, it's job is to create the lit and the shadowed areas on the face. If there is no other light on your scene, the areas where the light doesn't hit at all, should be very dark. If you use a hard (small) light, the edges of the shadow are hard lines...if you use a soft (large/close) light, then the edges of the shadows will transition smoothly over a greater distance.
So once you have your main light giving you the highlights and the shadows that you want you can decide if you want to use a fill light. The job of the fill light is to add light to the scene, specifically the areas where the main light isn't hitting (filling the shadows).
But if you put your fill light at 45 degrees opposite your main light, you risk adding light to only the shadow areas, which evens out the lighting on your subject and you end up with a boring ratio of light to shadow.
The old school / traditional place to put the fill light, is very close to the camera axis/position. The fill light would then give you an even 'wash' of light. It lights up the lit areas as well as the shadows, allowing you to keep control of the ratio.
The third light is a nice touch. It gives separation between her hair and the dark background, but as mentioned, her shirt is still lost. Adding another light or two (kickers) is one way to fix that, but you could also add a little light to the background to help with separation.