New characters don’t have a thumbnail yet. To generate one, go to the Actor Information panel and click the snapshot button to create it. On this panel, you can also add a Description, edit the Name, the Height or even set up thematerial typesor thecolor variations.
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You can add TAGs to your actor to keep your library organized and easily find it later using the search box of the Actors panel. More info about this on the following article Using Categories and Tags.