I really like the middle grey one the best. looks like a cool military base. yellow stands iout too much and would get hit with a bomb quickly hehe. my only issue is it doesnt really seem like a street prop. great work reguardless tho!
I like the gray, I can definitely imagine passing it on the street in some city from Blade Runner or The Fifth Element or something. A silhouette of a person would definitely help people who can't quite grasp the scale.