Images do not get removed from the database or file system when the associated web content article is deleted. These remain in the Image and JournalArticleImage tables.
STEPS TO REPRODUCE
1. Create a web content structure with an image field. Add a template for the structure.
2. Create a web content article based on the structure with an uploaded image.
3. Send the web content article to the Recycle Bin and then delete it.
Image removed from journalarticleimage, image table and data folder
Image remains in journalarticleimage, image table and data folder