I've been working and experimenting  on a bigger scale recently while still trying to get a decent balance between the figure and the building and playing around with different kinds of line
One of the problems I've encountered with doing a crowd scene however is that you have to get the proportions and shape of each figure pretty much perfect as a mistake will have a knock on effect which can lead to a figure later having some very noticeable mistakes in their positions or proportions. This means if I were to move on to an even larger scale (which I plan to) I would probably have to use a projector as on a larger scale the effects of slight effects would be even more noticeable and it would be harder to get prefect proportions on a large scale.
This isn't a problem so much when there is only a single figure though or even if there's just a small group. I may do a small  group on a larger scale as there are a lot of issues with doing a larger crowd. The main problem is I can't get a decent picture of a cohesive crowd at the train station. I've took pictures and observed the building at various times of the day, especially between 5 and 6 when I thought a large amount of people would be returning from work. I've never found a large crowd around the station though. I can only ever get photos of people in sparse groups spaced out outside the station. When I try to turn these into drawings however the figures look odd without a background like they are just hanging in space. The lack of a background isn't really an issue in single figures or even groups if the people are somewhat evenly distributed and touching but without a background a sparse crowd just looks odd.
I have been thinking of ways of putting in a sort of background to this kind of work but so far there is nothing that's working to well.