It's sound quite muffled, I'm not sure how to put it into a word, it's like trying to sing with mouth close.
Do avanna using vocaloid editor? If yes, then i think you can make it sound more open by raise brightness (1/3 or 1/2) and a tiny bump on clearness (3-5) should do it, if it sound too open, you might lower the accents param to 10-30%