Thanks to the size of the figures, it's pretty easy to read the space in this picture. Everyone is either big, medium, or small. The shapes do get a little bit tangled to the left of the vendor's cart. I'd consider putting some of that same purple glow the figures on the right have on the woman on the left. It's no sin to change the composition to make it easier to read sometimes.
Here are a few images that could use a little tweaking to make the space more obvious. You can adjust the color, value and edge quality as well as the composition to strengthen the spatial structure.