Lighting bros, what are your suggestions/ critiques for a render like this?
I struggle with lighting, so I do some dumb shit quite often
Well, that depends on what you're after. It's a good enough render for most VNs that circulate around.
That said, I'll be nitpicky since you asked for it. First of all, from what we see from the composition, the lighting seems off (probably looks so to you as well to ask for it.) Main reason is the directionality. In the composition, the light source is clearly behind her (the window), yet we see her front almost perfectly illuminated and shadows dropping on her hip from her arm with no obvious source of lighting and the lighting on the background is too flat to betray other lights in the scene.
That's not to say that you CAN'T have other light sources, just that me as a viewer am not aware of them. And I could imagine other sources potentially, but it seems that the light comes from everywhere. Left rim light, right rim light, background light and some fill light in the front. Which brings me to my next point.
Personally I think it's easier on the viewer (quite possibly there's a rule for that in some book somewhere) to have the light sources come from one angle, maybe two, not everywhere. In the case of that specific render, I would probably turn her around (or rotate the hdri if it's not a modeled interior) so the window is on her top left. Add some nice rim lighting on her left side, possible a bit forward to get some interesting shadows on her abs, pubic hair, thighs etc. Add a key light at the window to make sense and a very soft low intensity fill (or let the hdri play the role if it's an hdri.)
Why her left side? Well, the hair drop to the right of her face and that would drop her face in darkness. From her left you'll get nice shadows showcasing the form of the face, from the right you lose that detail. Finally I'd play with aperture/f-stop to darken the scene slightly because the background is blown out (especially at the window).
Now if you WANT that blown out aspect (say, middle of the day, bright sun etc) you'd need to turn the lights WAY up to make sense. As it is now, the background looks like middle of a summer day and the subject (the girl) looks like she's posing right after waking up in an early morning. Which only adds to the confusion of the light directionality.