Why do a lot of people display GF Galaxy Convoy/Cybertron Prime with his wings upside down?
Because that's how it is in the instructions?
In Hasbro's version anyways, which is clearly a mistake seeing as how the animation model and the Japanese version of the instructions have the wings pointed up, guns underneath the arms. All the sculpted details are also on the other side of the wings.
Well it's not so much to do with Yamato. Strike and Super Valkyries are only defined by the type of Fast packs they are equipped with. The only difference between a Strike and Super Valkyrie is the right booster has the laser cannon instead of the missile pod. The core Valkyrie is still the same. A VF-1S is a VF-1S. There is no "square-faced" VF-1S. The VF-1S has always had a rounded face in the animation and line art, the toy just had the square face because of poor toy technology back in the day.