Tidal Bonsai
Omono
A rule of thumb to go by for depth of pot is the depth of the pot should be about the same as the base of the trunk.
So, too my eye, all those pots look too deep. Maybe it's because of the way you took the pictures. It gives a better perspective if you move far away, 20 feet or so, and zoom in. Then the pot is less in the foreground, and the tree in the background. And get the camera even with the lip of the pot, so that only the front of the pot shows.
So if I am looking for an oval pot it would be approximately 8 inches wide (the 2/3 rule) and 1.5 inches deep?