I think you did an awesome job modeling her but her skin looks too perfect. Some imperfections and wrinkles or asymmetrical emotions like lifting one eye brown up or something would give the render a more realistic look. The background looks great though. And maybe you could change the lighting on her for more character in the render with more shadows/contrast.
I like her a lot! She has personality and you definitely captured the stern look from the original concept art.
In my opinion the face paint looks strange: it’s texture is so much like her skin that it allmost looks like part of her skin. Maybe some subtle changes in texture noise, roughness or bump can accentuate it? Or a more frayed, brushed look towards its border?
Yes i think thats a big part of what i can improve. Its the first time is used asymmetrical sculpting to be honest because its quite a hassle in blender.
Light is a good point to match the original. I need to look up how that contrast look is possible in blender, i was not able to do it.