While the effort to fill out gallery pages is apperciated, I must ask why are you also removing the image captions? Out of all the changes you have done to galleries, that one is the only I see counterproductive.
You need to take into account that a wiki is not made by its contributors for themselves, but to readers that are not necessarily familiar with the site's contents.
While the filename includes the image's source, it forces the reader to either hover over the image (if they're on desktop), click on it, or open it in another tab. And this only works under the assumption that the reader already knows that the image's source is included in the filename. Furthermore, if the reader wants to go to the image's source, they'd have to go to the file's own page. It's much easier to include a direct link to the image's source right under the image as it appears in the gallery.
2) Once the image is uploaded, please don't forget licensing.
If you uploaded it through the Special:Upload function, make use of the "Licensing (Required)" dropdown feature before clicking "Upload File," and choose the apropriate type of licensing. "A single panel of a character," "A regular comic book cover" and "Movie screenshot" are some of the most common options.
If you uploaded it through the "Add a photo to this gallery" function on the bottom of galleries, or you didn't select any licensing option in the dropdown feature of Special:Upload, you'll have to add the licensing manually. Go to the uploaded image and click "Edit," you'll see two rows of buttons to insert templates or format functions. Click on the button that has a single polaroid photograph on it (found in the bottom row), and the template will be added. Be sure to fill in the "License" field with the respective license. Most common licenses are "Comic Single Panel," "Comic Cover," "TV Screenshot" and "Movie Screenshot." If the licensing you added is not valid, the image will still appear as unlicensed.
3) Whether the image template with licensing has been added automatically or has been inserted manually on the image, please be sure to fill in the respective fields there are, including "Source," "Universe," "Subject#," etc. to help sort it out.
Not familiar with the specifics of the image in question, but in general every image must be licensed to be legally displayed on the site, something that cannot be done if the source of the image is unknown.