I don't know if it needs to be darker. viollet outline and not so good scalling (not your fault) makes it hard to judge :d
For a change, i wonder how high does the platforms reach and then he tower ;p I'm estimating, very high ;o
The thing is, it is not that easy to create something high and cheap. You need good architect, good materials and builders who knows what they are doing. That's rather expensive.
Might be the city gov made the platforms for the people, but i don't think they would with the towers.
As for the supporting collumns, you need arcs or the floor not directly above collumn would be a subject for collapsing. Look how baroque or renessanse cathedral architecture.
Instead of towers, think about using ramps like you did on tavern balconies.
IMO the bottom tents should be partially incorporated into the collumns. Some can be even built around a column and you can make use of shacky walls, which don't exist yet ;p
You can make use of my fence, i'm sending you through mail ;p