IMO, with my background at risk, I have to say that the lighting is just ok.
I keep saying that there are no correct ways to light, but, there are plenty of wrong ways.
What I mean by that, is, again, photography, both still, and motion, rely on first impression.
There are many ways to get that impression, and most of the time it usually falls back on the lighting.
Here, your image looks flat to me.
It's like your key light, and your back are at the same levels of transmission. Your, f stops are similar.
If this is the case, most photographers in my industry never keep the f stops the same on a lighting set up.
Your key is where you get your base level, and normally your fill is softer, and your back is a bit hotter to give a nice edge.
Negative fill is introduced either by using dark fabric like duvatene, or using even less light on one side of the subject. this gives the nice shadows, and makes the light more interesting.