Derived work based on File:Bishzilla.png.
This image is used on a user page of a Wikimedia user and is stored on Commons according to the rules set out in Commons:Project scope#File in use on Commons only: the uploading of small numbers of images (e.g. of yourself) for use on a personal Commons user page is allowed or Commons:Project scope#File in use in another Wikimedia project: the uploading of small numbers of images (e.g. of yourself) for use on a personal user page of another project is allowed as long as that user is or was an active participant on that project.
If the image ceases to be used it may be eligible for deletion as it may have no educational purpose.