I'm glad you like the little bits going on with in the set. There's an argument on the rear wheel where one chap is threatening to bash another with a stone. The other side there's the figure pushing on the hooded figures as the banner starts to fall out of place .
Then the two figures at the front trying to get the chap on top to listen.
Then as Fram has pointed out I made a nod at the earlier comment about the wheel chap looking like he's about to have his foot run over.With a chap who did

As for robe colours I'm thinking off white as the starting point . As I originally thought of black or Combi of the two. But I'm pretty sure that Black would cause them to disappear into a dark blob when viewed at a distance. A combination of the two is likely to act like a dazzle camo .at similar distances. Where as the lighter colour will allow natural gaps and shaded areas to still distinguish them as individual figures at a table top distance.
( Well that the logic anyway.)