Enhance the professional appearance of your book’s interior by using a glyph that relates to your story instead of asterisks for section breaks. There are many options in unicode and wingding fonts which are easier to use overall than a jpg file.
For example, multiple jpg files can be a nuisance for some print on demand establishments such as Ingram, where the pdf file needs to be distilled. Creating a pdf from a MS Word file reduces their resolution, so each one has to be replaced manually. If every section break is a jpg this would be a major pain!