Well on the whole I agree with what Mike has said above, especially on the fact that these are really struggling for a point if interest it is worth praising the fact that on the whole these are exposed reasonable well all to often with night scapes like this all the darker areas are a sea of blackness with no details at all, no detail in the sky etc and you've not done that, okay the exposure isn't perfect, it's a little over exposed and the high lights could certainly stand a little knocking back too, but your really not a million miles off, I think one of the reasons your struggling is we are not really looking at a iconic skyline here, lets be honest if someone say NYC, Sydney, London, Hong Kong skyline pretty much everyone can imagine it with little or no difficulty, all I know about Miami architecture is parts of it are supposed to have some amazing Art Deco architecture...but it's not really a world famous skyline as much as floridians may want it to be