I have difficulty shooting in the dark, so I shot in the light and used the negative. Then crop, solarize and blur. I just got lucky that the clouds were visible.
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The window and dark around it is fine... but maybe a better texturing of the clouds would help push this picture further... but of course you can't control the look of the clouds.
I'm left wondering why you chose the askew perspective for this image... It's an interesting image, but there isn't a clear point to it that I could identify with.