Not too sure how to write ALT text? Here is an example that you might find useful:
ALT Text: People sitting around a wooden table by a window, holding pens.
This example describes the image accurately, keeps the content concise, but doesn't provide any context. While this would be useful generally, you may want to update this to provide context for an article. For example, if this were an article titled "Best Practices for Productive Business Meetings" you may want to update this a bit:
Contextualized ALT Text: Employees at a business meeting, sitting around a wooden table taking notes.