I don't see a Sanity-related question in your message. You've only provided a Twitter link to a photo. Could you please share the actual question you'd like me to createa...

// In your author.js schema (the document being referenced)
export default {
  name: 'author',
  type: 'document',
  fields: [
    {name: 'name', type: 'string'},
    {name: 'email', type: 'string'},
    {name: 'bio', type: 'text'}
  ],
  preview: {
    select: {
      title: 'name',
      subtitle: 'email'  // This shows up under the name!
    }
  }
}

preview: {
  select: {
    name: 'name',
    email: 'email',
    published: 'publishedPosts'
  },
  prepare({name, email, published}) {
    return {
      title: name,
      subtitle: `${email} • ${published || 0} posts`
    }
  }
}

preview: {
  select: {
    title: 'title',
    authorName: 'author.name',  // Access referenced author's name
    categoryTitle: 'category.title'
  },
  prepare({title, authorName, categoryTitle}) {
    return {
      title: title,
      subtitle: `by ${authorName} in ${categoryTitle}`
    }
  }
}