Lighting is hard to comment on without knowing your intent and seeing your stages. For example, are the stage models enclosed spaces, or are they open on the top and at least some of the sides?
I have my own style that isn't to everyone's taste of course, and beyond that I'm no expert. But looking at all the Trek images you've posted recently, I would have lit all of them with just two or three spotlights: a low key and a low fill (low because of the indoor settings/enclosed spaces), and maybe a very minimal direct overhead if the area was meant to be brightly lit (like the hallways).
Just in general, don't be afraid of shadows and darkness; instead, embrace these as important allies. Too many cg artists (both hobbyists and professionals) are overly concerned with showing off their models. That's understandable, as the models are a lot of hard work. I do it myself sometimes, especially here at PF as it's often the case that showing off the details and changes of a model is the only real purpose of the image. But often what we should instead think about the best artistic or narrative use of light, dark, and shadow for telling any particular visual story with an image.
What's the most important character or object in an image, or the locus of action? Make that spot well-illumated, and leave the rest to fall of into shadows. Even if it turns out that approach doesn't produce a satisfactory result, the process of thinking about those kinds of things will probably be helpful in inspiring thoughts of some other way that will be better for your image.
So generally, I'd say this image is already well lit. But you might try adding some subtle color variations to the lighting. For example if you have three lights, make one a bit yellow, another a bit reddish, another leaning to blue, etc.
Another way to look at it would be that the captain's character is least active in this scene, but she's the most illuminated; maybe the lights should accentuate the other two characters instead.
Just winging it here, hopefully something in all that might be helpful.
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