We recently fixed an issue affecting Marketplace listings that was causing us to display low-resolution images on some monitors where a high-resolution image was more appropriate.
Before fix:
After fix:
You can read more background on the bug (and how we fixed it) here: Log in with Atlassian account
Thanks to @boris, @adam, @edave, @peter.toudjarski and others who have advocated for addressing issues related to image resolution - and to @parora who got it fixed!