There are different ways to shoot a sunset.
1. Silhouetted
Spot meter to an area near the sun for everything in the foreground/background becomes dark. This will give u a glorious golden sun.
2. A wide angle shot where everything can be seen (not silhouetted) in relation to the sunset.
For this shot, I would choose the silhouetted approach and zoom in on the flats, getting rid of the highway ramp in the foreground (which I find rather distracting).
Keep on shooting!