Very interesting and creative display. I don't know where this display was positioned in the total design of the exhibition, because that makes a difference in the arrangement.
If I HAD to display the identical three items, one idea is attached. If one looks carefully, the terminal twigs of the Cork bark Chinese elm bonsai have a right to left eye movement, so would perhaps be better positioned on the right side of the designated display area.
I like the three different designs and heights of the display tables and the accessory looks very interesting. I would have used a shallower and round shape for the accessory, but then I can't identify it, but it looks succulent from the photo.
This is just a quick virtual of my arrangement of the same three items in the same display area.
As long as you removed the bamboo separator, you might like this better. The texture of the elm twigs is too similar to the dead wood twigs on the juniper on the left side, while it provides interest comparing it to the juniper on the right side. Besides, the movement is more pleasing this way. . . .
Flipping trees is an easy way to MAKE it work, but it's a better exercise to make changes in what you have to work with. The tree was not able to be turned around to use the other way.