Do you have image editing software?
#1 is a little blue and could stand to be warmed up some. The horizon is tilted to the left and the barrel distortion from the lens makes the closest tower lean towards the center of the image a lot. Both are fixable with editing software. Diagonal lines usually make nice images, like this one. I think it would have helped if the diagonal had started higher on the right edge and ended closer (and a bit higher too) to the left side of the frame.
#2 The horizon is lilted with the left side being low, so again the tallest tower has a lot of lean. This perspective looses most of the diagonal and the bridge roadway is a bit to close to the center of the frame.
#3 Not much I can add beyond what ambrose portraits said.
Your flikr has other images with the same problem, underexposed foregrounds. That's always a tough nut to crack when making senic images with a lot of the sky in them. Landscape photographers use Graduated Neutral Density filters to cope with that. Do you mostly use the AUTO setting?