I think it looks good, but if you wanted it a bit fuller, you can add some panels. If you don't have enough blue, try some panels of the white, if you have any leftover.
What if you made it shorter? How much seam allowance do you have in the side seams? you could always let it out as much as possible...even if only a 1/4" on both side that would give you 1/2 more in the fullness.
It looks amazing! Z is so beautiful. I love that color on her.