Just play SD 1.5 for several months, and share what I learnt as personal record. Hope could also help people fresh here.
The pdf file is basically showing the prompt effect step by step, including below content:
By the way, I usually generate landscape image(768*512). Although the hit rate is under 1/10, and many horrible body part generated. I DO like the surprise from 768*512 image, just like the cover image for example.