
Could you use some sort of sorted naming convention?
Even just use the chassis name, followed by a iteration (in case we have more than 1)
Example:
- JR7-D-1.png
- JR7-D-2.png
- JR7-D(S)-1.png
- JR7-OXIDE-1.png
This would sort the portraits by chassis at least. Perhaps add a weight ahead of that so they sort by weight as well.
So 35-JR7-D-1.png.