I think the background it rendered fine as the focus is meant to be the character, so it’s better to have a slightly out of focus background if that’s what you’re going for. I think you’ve been staring at it too long! The perspective is great. The only thing I changed is the lighting as the background actually matches the character too much in terms of value, and she blends in a bit. By darkening the background it helps her glowy stuff to actually glow and the lighting can stand out. The background also becomes less of a focal point. I also adjusted the light curves so the lighting you did can shine a little more. It’s a very dramatic piece so having more contrast in the lighting can help emphasise that. Hopefully this helped, your drawing is awesome so don’t overthink it too much!
Thank you very much! Darkening the background indeed helped!