We don't know the field of view of the lens (or crop) being used here, so you can't say anything about the apparent size of objects. With a smaller FoV lens, or

We don't know the field of view of the lens (or crop) being used here, so you can't say anything about the apparent size of objects. With a smaller FoV lens, or even just a tighter crop, the Earth could look significantly larger. If you took a normal snapshot of a scene on Earth with a typical 55 degree field of view lens (e.g. your smartphone's 1X lens) I think you'd be quite surprised by how small the Moon appears in your photo.