Sorry for the really late response. As your latest two images show really clearly, the background appears to be mixed with a kind of light blue, lighter than more or less everything in the foreground except for lamps. This does give a stylized look, but combine the saturation and the brightness of the blue, with the fact that it’s a linear mix and not a multiplicative filter, this makes it look like a glowing blue fog, almost bioluminescent.
I would decrease the brightness of the blue. It’ll also give a better dynamic range to your image, increasing the focus on the foreground of the image and better balancing the color palette, without changing the stylized feel. Right now, the two major colors are about 50/50 in strength, which is a big no-no in color theory.