In fact, the entire message should show that you know the recipient. Personalized offers or questions about the experience with the purchased product are great because they confirm that you know the recipient and that you already have some kind of relationship with them. Our contact management tools will help you take care of this aspect of your email marketing!
Sending a one-sentence email that is just a prelude to a large graphic tha chinese overseas asia database makes up 90% of the message is not a good idea. Avoid using graphics altogether when emailing more than one person. Stick to text, and if you want to share something visual, use a link (preferably from your own domain, don't use a link shortener).