Image servers are quite demanding, so we are looking for rather central solutions that all communities can use instead of running an image server for every community.
For small images the CommunityWebsites can be used (for example through Drupal image galleries).
For larger images in particular but also for images in general we recommend to use http://www.morphbank.org.
Images and thumbnails can be embedded in any website. A zoomable viewer for larger images exists too, but currently can only be used from the morphbank site itself. The service is free.
Information about the API and further plans can be found on TDWG: