Illustrations that I have added to Wikimedia Commons and inserted in some articles:
Illustration of the electric field surrounding a positive (red) and a negative (green) charge (click for larger image). I inserted this illustration in the Electric field article.
Illustration of the electric field surrounding two equal charges (click for larger image).
Illustration of the electric field surrounding one positive charge (click for larger image). I'm not quite satisfied with this one, but I don't see any article where it would be obvious to use, so I won't improve it just now.
When a project includes multiple operational pages, it is generally best to redirect their discussion pages to the main discussion page for the project. That way, participants remain aware of what is going on with the project without having to search out every nook and cranny where discussions may be taking place.
The exception to this strategy is when a task is delegated that would generate a great deal of discussion, and centralizing it with the project's other discussions would create a discussion page of unmanageable size.