Pretty Good
I've never really heard much of Mariah Carey's songs but I actually like this one, and I found your video to be quite funny.
Your art style reminds me a little bit of Tex Avery.
The colouring is really nice, especially the "glittering" dots all over her dress and eyes.
Also, the kids' expressions were really funny; and even though I know your attempt was to poke fun at her, a lot of the animation of her was pretty cute, especially the one at the end where she was in the pink dress.
Great job and cannot wait to see more from you.