Yes, the impression I have on this marble in question is that it looks more like the clay ones like the one I posted.
The way in which the color is put, in some places washed out, which tends to fade just as you can see in different clay marbles.
Yes, it would be more appropriate to have further images of this marble, perhaps keeping it more at a distance.
A lady here in Italy described to me how these clay marbles were created, colored with colors made with flowers, so here is the reason for rather faded colors.
To what extent this is true I don't know, but that's another story .....Regards Roberto