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Clearly, if you aren’t in a car, you aren’t a serious person doing serious, important things. /s

4) Throughput is probably a better metric than density and that's hard to guess from static images.

1) Assuming that this is a one-way street for cars and the direction has not changed between the two pictures, it does seem approximately the same time of day based on the shadow angles.

But that doesn't tell us anything about day of week which could be a huge factor.

2) Assuming at least one person per vehicle, and assuming that the first stories of the buildings are about the same height in both photos in order to compare scales between the photos, the first seems to have a higher density of people.