Hi Bruno Michels,
It depends on for which mode you want to this - when the control is in master mode - all items are listed or you have opened a single item.
In both the cases the way that you have to do this is the same, but the difference is in the methods of NewsView control that you have to override.
For master mode when all items are displayed in a list you have to override SetItemMetadata method. The method has two parameters - itemContainer and contentItem. You need to get the content from contentItem.Content
property and then check each occurrence of [Libraries]Guid by using RegularExpression. Then get the image by the ID available in the dynamic url, and there you can call libraryItem.GetMetaData("Author").ToString(). Finally you need to change the contentItem.Content and add the image Author.
For details mode you have to override SetSingleItemContent and follow the steps above.
The better option is creating another metakey and use it to show the image - similar to Thumbnail. This will be the easiest way.
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