You're handling the arcade card sections very well, but I have a very large collection of (mostly Japanese and only the fronts of) arcade card images salvaged from the old Dinosaur King website and scavenged from across the internet that I've never gotten around to uploading because I didn't know how to file them other than "and here's another one".
Over probably the next few days, expect a major influx of new card images of varying sizes and qualities that you'll unfortunately have to sort through to identify the versions (but will still be grouped by dinosaur) and which may be more inconvenient than helpful, but will at least be present to be sifted through. I'll only add cards that aren't already present, but make sure to use the "Upload new version" option if you have better images for them you've yet to add (file types must match to work, jpg vs png, etc.).
If the task seems too much, I'll do my best to learn and identify the versions to help, or I could limit it to one Element at a time. Because of alphabetical file sorting, I'll be starting with Earth in a few hours, catch me before that if you have any objections or suggestions.
Didn't I ask that you "Upload new version" any better images you had of cards I'd uploaded? Now I'll have to constantly patrol several pages back in the Images section to weed out the superseded cards while remembering what simply hasn't been put on pages yet. You can "Save As" a copy of the image with a new file type to change them into the file type of my image if they're different.
As I just said, File --> Save As… a new copy of the image and change its file type (just re-typing the extension in the name doesn't work). There are only 3 types my images are, jpg, png, and gif, and you can see which they are in the name. Do you not have an interactive image-viewing program on your computer? (And a number of my uploads already are in fact the file type you normally use, jpg.)