This is on of my work sample which I have created to improve my skills. At initial stage I write product listing just like others, means keyword research and then write listing for a product but then I learn (how to do in - depth keyword research, competitor analysis and create listing that is Amazon buyer friendly and Amazon friendly. I learn about keyword relevancy score sheet and a method of write title and bullets of the product.
You can click on this PDF (how it is different from other product listings.)