Great colours. The ISO is rather high - did you not have a tripod with you? A lower ISO will give better clarity. The composition has some lead in lines which is good, but the cityscape is a bit too far away so it's difficult to make out all the features. As the Great Robert Capa once said "if your pictures aren't good enough, you aren't close enough". Another point to note is that you need a much smaller aperture (F16 or more would do it) to give sharpness all the way through the photo.