Question Vellum and Atticus

I need a relatively large graphic to be at the top of each chapter. Which of these would be best for this? In Vellum I would just add an image, but I don’t think that will format right, and the top-of-chapter images are small. Does Atticus have a better method of that?

Also, @Karyne Norton what did you use for formatting the interior of your book? Or did you outsource? How did you do the gradient pages? That was sweet.