i think you'll get more use out of your palette if you spread the values out a little, you could use a transition color between the light blues and the dark blues, and the darkest blue is about the same value as the purple. the wings look nice, outline on the tail is a little jaggy, if you had that midtone blue you could aa to smooth it out a little more.
Davesprite reference. Win.
this thang is super shiny and I like it.
Nice job. I love the wings. :)