Two audio book ?s

I am working on the audio version of the book and would appreciate your views on two questions. Please sent your views via the Contact form. 1) What few seconds of sound should be between chapters: a) silence b) town hall clock chime, c) cymbal tap, d) background sound bite hinting at the next chapter, e) something else? 2) What to do with photos, images, charts: a) don’t mention them, b) describe them?