Good alt text for images should be:

Good alt text serves two main purposes: accessibility for visually impaired users and SEO. It should be concise but descriptive, accurately conveying the image's content. Including relevant keywords when appropriate helps search engines understand the image's context and relevance to the page. Finally, alt text should relate to the surrounding paragraph content to maintain thematic consistency and improve user experience. Making alt text as long as possible is unhelpful and can be spammy. Identical alt text to the file name offers no additional value. Repeating only the primary keyword multiple times is keyword stuffing and can negatively impact SEO.