The "?sfvrsn=0" part of the query string is used to display the number of edits that have been done to this image in Sitefinity images module.
Another way to select an image is to add the built in ImageField. In the dialog for adding custom fields select "Interface widget for entering data" to be "Custom" and in the custom textbox enter
Telerik.Sitefinity.Web.UI.Fields.ImageField which will add the built in image selector.
This selector always select the original image, not its thumbnail.
the Telerik team
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