Juice=Juice's Blogspot: [Translate] Murota Mizuki's Interview

Her weakest point in singing is rhythm, which is what the voice lesson was about.
Her rival in dancing is Inaba, because she’s so good that she actually learns from her, and her rival in singing is Danbara, because even though she just joined, her voice is so beautiful that it brings her to tears.

Tsunku’s comments on her this past year: Your dancing and singing have gotten more than reasonably good, so I want you to focus on your expressions in singing. It’s necessary to completely immerse yourself in the world of the lyrics. Also, your impressions are good, but that might be their limit. You’re growing more and more, so do your best! Your dancing is sharp, it’s good.
She cried in response to the progress she still has to make in singing.
Her dream is to debut soon like JJ and have people remember her name and face, and appear on Kouhaku as a famous idol.