Looks good... better then I could... but if u r looking for comments or ideas to better enhance it... I have few ideas...
1. Since its a elevator shaft and to spice of the monochrome look.. add a few yellow warning signs,, like ...

or
2. Also maybe add a CCTV Camera for security purposes...
3. Not sure if u are able too or not... but if u are looking for it be old... but up-to-date,,, keep with the hightech stuff like u said but add cobwebs or spiderwebs.
4. in the circle area the pillar has no ending point,,, it looks like a half circle no definition of where pillar ends

5. Also can u soften the edges of the light circles,,, since theres no lamp shade or what not there should be no hard defining lines of where the light emitted ends,,, hope this helps and keep up the good work.