Those have nothing special. Exposure is good for sure, clouds are well rendered, but there is no real subject. Maybe 20 minutes later, the same composition would have been better (more orange tones). The trap with dawn and dusk is (to me) wanting to show ONLY the colors/clouds/sky. It's something difficult, and often, it's better to use those colors in a composition to "help" or "beautifulize" another subject.