Funnily enough, after I had finished inking this piece I suddenly realized that the only G3 in the entire image is the Ponyville Minty next to the two G4 minis.
Ah, so that's what that is! It was the only thing I couldn't work out.
There's a lot to love in this picture, but I want to give special praise to the way you nailed the relative scale of the toys.
-Tabby
the princess with claws