<img src="#" alt="..." title="..." width="..." height="..." />
Proper style and accessibility standards dictate that you should always include the alternative text attribute. The key for this is simply
alt="". The value in the double quotes should describe the image. This description is used by screen readers for those who are visually impaired.
Therefore it is critical that you provide a detailed description, especially in the case where the image is necessary to understand the content of the page.
alt="Me getting help."
alt="Justine receiving help from an instructor while at a computer."