ah great glooming depression ... effective if that was your intention. technically indeed v flat but the flatness is part of the composition, so thats ok.
the thing not going for it is the uneven vignetting and more importantly, in my view, some solitary point of interest to hold the entire pic together.
For example a big bowl of plain rice is not very interesting, but if there is a just a single rose petal scatter on the rice, it gives it the tension needed for an exciting picture.
Here maybe some selective colourisation, some small but very bright light, or a single solitary person etc ... So thats the little thing I think missing ...