If the idea is to represent the move, the logical form in a set where the Amazon is a Staunton Knight with the head of a Staunton Queen mounted on top of it, would be a King's head on a Knight. The cross could be omitted for the non-royal case.
If the idea is to represent an actual centaur, rather than just an arbitrary man-horse chimera, the Staunton style seems to lead to something like this:
That is, omit all upper extremities, and only leave a stylized version of the lowest for support. The one in the middle already breaks Staunton style by abandoning cylindrical symmetry (ellipticity is used in the hind legs and torso, and excentricity in the horse body).
The tail is in fact already dubiously detailed; if the cut in the Bishop's head was deemed enough to represent tusks, the tail should probably be represented by an upward diagonal cut just above the legs...
Of course it would be quite possible to apply further symmetry breaking (rightmost image) to get still further away from Staunton abstraction and closer to realism: the hind legs and torso could be slanted backwards, the horse's body forwards. An indication for the horse's front leges could be added, dangling down like it is prancing.
If the idea is to represent the move, the logical form in a set where the Amazon is a Staunton Knight with the head of a Staunton Queen mounted on top of it, would be a King's head on a Knight. The cross could be omitted for the non-royal case.
If the idea is to represent an actual centaur, rather than just an arbitrary man-horse chimera, the Staunton style seems to lead to something like this:
That is, omit all upper extremities, and only leave a stylized version of the lowest for support. The one in the middle already breaks Staunton style by abandoning cylindrical symmetry (ellipticity is used in the hind legs and torso, and excentricity in the horse body).
The tail is in fact already dubiously detailed; if the cut in the Bishop's head was deemed enough to represent tusks, the tail should probably be represented by an upward diagonal cut just above the legs...
Of course it would be quite possible to apply further symmetry breaking (rightmost image) to get still further away from Staunton abstraction and closer to realism: the hind legs and torso could be slanted backwards, the horse's body forwards. An indication for the horse's front leges could be added, dangling down like it is prancing.