Personally, I hate the drastic height difference trope in episode. Especially as the problem with it in the app is that it changes scale everywhere, and in this instance, she appears as a child in my opinion. That’s not being mean, just saying from viewpoint of an audience member for your story, it so far looks like she’s a child.
Adding more detail wouldn’t really show up given the size of her. She needs to be the focus if she’s the MC. You want readers to know who they are reading about, have them drawn in by the cover.
The pen, I get that he is a writer, but it’s not giving writer vibes as much as a random placement. If you want him to appear as an aspiring writer, maybe add more to him, like a book and a pen, and change up the pose so he isn’t just holding a pen.