Overall the tone and composition of the night one is much better than the day render, although it's still not great. Almost all the materials in both scenes have a plastic feel to them. Corona is pretty simple as far as render settings and environment. Those alone won't make a good render. It's the time spent on scene development and texturing. You can't just grab a model from somewhere and plug it into Corona, add some reflectivity everywhere and say, "what's wrong with my scene....it's not as good as I think it should be." First you have to really think about the scene, determine what you want the scene to say and then do a lot of trial and error while always thinking about the goal. Keep practicing...you are on the right track.
