A useful Bluesky image post combines a clear image with enough written context to understand why it matters. Make essential information available in text, add an accurate image description, and inspect the preview before publishing.
An image may attract attention, but the post should not require someone to decode a dense graphic before they understand the topic.
Decide what the image contributes
Use an image when it shows something that benefits from being seen: a product detail, a process, an illustration, or a comparison.
If the image is mostly a paragraph, consider putting the words in the post or linking to a fuller explanation. A screenshot of text can be harder to read, search, and translate than ordinary text.
For example, a designer sharing a spacing fix could show the before and after while explaining the change in the post. The visual and the words then do different jobs.
Write context that can stand alone
Name the subject early. “Before and after: increasing the label spacing on a mobile checkout” gives a reader more information than “This made such a difference.”
If the image shows data, state what the numbers describe and where they came from. Include a time period when it matters. Do not leave essential definitions in tiny chart labels.
A direct source link helps readers inspect the underlying information rather than relying on a cropped screenshot.
Add alt text for meaning
For a design comparison, a useful description might be:
“Two checkout layouts side by side. In the revised version, field labels sit above the inputs with more space between sections.”
Include essential words shown only in the graphic, but avoid repeating the full post unnecessarily. For detailed examples, use the alt text guide.
Bluesky’s search guide notes that search results can include phrases in image alt text. That supports using accurate subject names; it does not justify filling descriptions with unrelated keywords.
Check the image as a preview
Make the main subject clear without requiring a full-screen tap. Keep important content away from edges that may be cropped in a preview.
For several related images, ensure each one contributes something distinct and that their order is understandable. Do not split a sentence across images when it becomes confusing if someone opens only one.
Use the Bluesky specification page for current file and format guidance rather than assuming another platform’s export is an exact fit.
Avoid unreadable details
Preview on a phone and check the smallest meaningful text. Enlarge the relevant area or simplify the graphic when labels are too small.
The readability guide explains why a sharp, high-resolution file can still contain text that is too small to read at feed size.
Before you publish
Read the post without the image, then inspect the image without the post. Together they should communicate the idea clearly without unnecessary repetition.
Check the description, links, image order, and crop in the publishing preview. Keep the source graphic so a correction does not require editing a compressed download of the published image.