I really like this! Super cute, and the colors are great and eye-catching ^^
Since you asked for constructive criticism, one thing I did notice was that the pink color of the waist area of her dress is a bit too similar to the hair color.
If the color and value of two separate parts of an illustration are too similar, they kind of bleed together and become harder to distinguish. This can be remedied by making one of them darker or lighter, or changing the hues/saturation up a little. It doesn't have to be by much, just enough to make them more distinguishable
Fantastic job otherwise