Do we need a 'livery' tag?
I don't know.
It seems unlikely that this tag will be very useful.
I'll list some questions where it might or might not apply. There may be a few more out there.
Are there roughly similar ones already?
I found a few but not all using the space-art tag. We don't have a "markings" or "symbol" or "logo" tag,
Note, I don't know how many of these describe markings that would count as "livery".
- What is the purpose of the black-and-white patterns on some rockets?
- Did the Saturn V rocket have any purely aesthetic features that didn't serve an actual function?
- Was there a rocket launched to space with Japanese manga characters painted on it?
- What do these markings on SpaceX's ship Mr. Steven represent?
- What organizations correspond to the logos on this ORBITEC Vortex engine rocket?
- Humanoid silhouette on SpaceX's Starhopper; what does it represent?
- Why does Curiosity have two images of itself on itself, or is one a QR-code?
- Saturn V Small Rectangles On S-II Stage