You should use one emoji per question and use it as a bullet point. Right now, it looks a bit jarring. Your intuition is correct (a bit of color/playfulness doesn't hurt).
When you say as bullet point, do you mean as in before the text? That's not how to use emoji in general. But a single emoji at any place within the text (as opposed to many of them) is a good idea.
Yeah I mean as bullet point. For example, see my blog: dvt.name. I use emojis as "bullet points" on an unordered list of blog posts.
I'm not exactly sure what you mean by "how to use emojis in general" -- emojis are just like any other character used in any way that seems to make sense.
