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Dungeons and Dragons taught me how to write alt text
Describe the most important thing first.
We then supply detail in an order that aids in understanding the main point, and discard information that is irrelevant to the overall concept we’re trying to communicate and mood we’re trying to evoke. There’s a big dragon, and it’s seriously pissed off, There’s ample room for it to move around, It can, and has previously made good on its threats, and that There’s not a lot of places to take cover. Unlike other web content, there isn’t really any other special way screen readers can work with alt text strings—short of increasing or decreasing the speaking rate.
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