I don’t mind seeing graphics inside an ebook if it’s needed to explain something ( like your facebook example ) but if they are added just to fill up the page or look pretty then I think they should be left out.

You’ve also got to think about the customer who buys your ebook and wants to print it out. They are not going to want to waste printer ink on something thats not relevant.

Thanks for the great content

Warm Regards

Dawn Kay