For someone still learning and the 3 sec. shutter speed that is an excellent shot.

To make some suggestions, timing is everything for this type of shot and timing means earlier in the evening when there is more colour in the sky and more detail in the buildings from the setting sun. This earlier shot would mean more available light and therefore a faster shutter speed and great sharpness. Specifically I am talking about that time in the evening when it is dark enough for the lights to be on, but there is still sky colour and some available light reflecting off the buildings.

Ronnoco