Add a "delete image" button
EoG currently allows browsing images in a directory via multiple methods. You can press left/right on the keyboard. Click the left right arrows when hovering over the image, or press the left/right buttons in the image properties dialog. There is also the option of doing this through the image gallery.
You can press the 'delete' key on your keyboard in order to delete the current image. In the image gallery you can also right click to move to trash.
I am proposing to add a delete button to the on screen navigation controls. A delete button in the image properties prompt and other places where there on on screen navigation controls should be added.
How would new users find out they can organize the pictures and delete ones they don't through EoG? My first instinct in a viewer like this is to see what pressing the 'delete' key on my keyboard does. Not everyone has a delete key as well. touchscreens, laptops and compact keyboards won't have it. Also the option for image gallery is hidden away. You end up needing to do a combination of using nautilus/Files on a per file basis which is more time consuming and not a really good UX.