Very cool photo........ let’s colorize this one.
No don't colourise it, it's overall greyness ie its lack of both high/lowlights will not allow for good result and much colorisation is only guess work anyway! As touched on elsewhere when this subject has arisen, even the most proficient of 'photoshop' users can only add slabs of overall colour with no variation in shade or hue so the end result just looks naff IMO! I'm not saying it can't be done (my working life has been in colour printing so I know what's possible) but such a task would take a a lot of hours to get anything near what a true colour pic would look like!!