This is amazing. When I was in elementary school we did projects like this with solid colors, had no idea that it could be proafied and look this amazing. I love the color scheme and all the different shades you used to make it work. Since this is a critique I feel I should find things you need to improve on. The only thing I can suggest is using more opposite colors next to each other. The purple and blue are next to each other for most of the picture and it would look cool if the red separated it more.