I love the colors and the composition but wish it had a bit more contrast to it. I did a vibrance adjustment and pulled the curve down a bit and this is what I came up with.
IMO, if you are going to do cool colors like these they either need to be very pastel or very vibrant.
Joanna, the composition is spot on and I like the color transformations - although agree with Jules that either really pastel or really vibrant is the way to go. IMO, this one could go even more pastel...