Whenever I see images in an RSS feed, they are embedded in CDATA, rather than surrounded by tags.
In my feed, I would like the images to show up without doing that.<
For completeness: In RSS 2.0, you CAN have a single enclosure inside an item, which per the spec. can be for a single image. However I understand that support among feed aggregators varies. More typically this is used for things like podcasts. The RSS 2.0 standard states:
is an optional sub-element of - .
It has three required attributes. url says where the enclosure is located, length says how big it is in bytes, and type says what its type is, a standard MIME type. The url must be an http url.
Note that you must include the size of the item, along with the URL and mime type.
However, as others indicated, including the picture(s) in CDATA is much more common.