I was just speaking about this on Discord, but sometimes you need to know about other cards in a set before you can really see other (parts of) Pokémon.
Here is Tauros from POP Series 2:
Can you spot the Entei? Maybe if you look closely, but it becomes more obvious if you also have the Entei card from POP Series 2 to compare it with:
Here are the two images overlapped with the more obvious Raikou included into the mix (both Raikou and Tauros had to be scaled down slightly):
Another possibly less obvious example of that is the HGSS22 promo Porygon card:
It’d be pretty easy to overlook the reflection of Porygon2’s foot, but fortunately HGSS23 shows us that the two artworks here connect to form a larger image:
