I'm not a great 2d person, but it looks to me like you have so many colours in the composition that they cancel each other out. I like how vibrant the central building is, think it would have a lot more impact if everything else was toned down - particularly the swathes of flowers in front of it, which draw your eye as soon as you look at the image. Sometimes, maybe less is more? The lighting might look terrific if the the image wasn't so busy.