too many different ways to interpret your question:
- which of these is the best looking picture
- based on these images, which of these is the most impressive looking city
- which is actually the best looking city, regardless of the images which are just examples
- based on these images, which of these cities has specifically the best looking skyline, regardless what the city otherwise looks like
- which is actually the best skyline, regardless of the rest of the city and regardless of the images which are just examples
went with the second to last one