A bit of tonemapping to bring out the shadow details
Nik Color Efex Detail Stylizer
levels
Orton effect:
[copy background
sharpen background
set to multiply mode
gaussian blur copied layer] levels to lighten up
Nik Color Efex B&W conversion
flatten, USM
dodge/burn
resize
smart sharpen
Think you edit this very well (but I'm not an expert, just started to try it myself). You created a wonderful atmosphere here. The light looks very mysterious.
Nice processing job, and a good choice for the subject. Looks like a set from a 1950s era sci-fi movie. Almost looks like an infrared shot. Would be interested to see the processing details added to this shot.