Not hypercritical at all, as it's up here for critique so fire away! I know what you mean about a range of tones, but don't think it's always necessary and think if I start filling in the shadows here it becomes a little ordinary, which is why I left the escalators as they are. One of the reasons I left the curves in at the bottom was to anchor the image, but also to give a strong clue as the what the structure was and where abouts on it the viewer is viewing from. Couldn't get any lower sadly.