In this article it says that you always should describe the picture with your alt text. For example a picture of a nervous worker on a website dedicated to negotiating higher salaries within the workplace should be named nervous worker shaking boss's hand.But logic states that the alt text for that image should be anxiety while negotiating salary because that is descriptive and more keyword rich. However it is mentioned that including keywords actually hurts your ranking.... I don't get it?How is describing a picture so specifically to the point you don't include a keyword help SEO?
Does SEO improve from picture alt text that doesn't include keywords?
seo;alt attribute