Thank you for your review.
The extension has option to add captions to images from the very first version.
To add captions to images please place artimageview.txt file to the images folder. File structure should be the following:
where a.jpg, b.jpg, c.jpg are your image filenames.
This is also indicted on the bottom of demo/support page: http://demo.artetics.com/index.php?option=com_content&view=article&id=95&Itemid=140
If you use Flickr/Picasa then the image captions are retrieved and displayed automatically.