Sitefinity CMS gives the user a vast flexibility to customize it's modules and functionalities and also gives full control over the html mark-up of it's pages and widgets templates, the option to put caption or any other custom field to the images are easy to implement.
If it is needed to display a title above the image like a caption, in the scenario where the image widget is placed on the page and selected an image from the library, then click the edit
of the image widget->Advanced
-> scroll down and find the Title
field->write desired title/caption of that image ->Save.
More appropriate approach would be adding a custom field into the Images module (Content
->Custom Fields->Add a field...
) and then assign this custom field into the widget template's mark-up. Here with custom field user will have the flexibility of choosing different types of field not only the text filed.
For more customization please read the article of "Extend RadEditor dialogs to add captions for images".
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