Good advice, how do I add more than one image here? Maybe I just don't know what I'm doing.

No problem at all, Lemmy can be confusing sometimes :)

What you did is selecting the header picture or link, which is only possible for one URL.
You can click the image button on the text formatting menu and then select one or more images (I believe GIFs are also possible?) and the attach them in the text box.

Sure you can let me know what you think about it, though to be completely honest, it was her ideas that I just implemented, but I'd love to make it better.

You don't have to alter anything to the design.

I personally would only increase the height of the saucer edge, because when you water the plants, everything will else leak on your table or whatever it's standing on. You can achieve that by just stretching the Z axis in your slicer, and that might save you from a mess :)

Also, I guess the plastic might leak too over time because of small holes in it, and the potting soil maybe won't hold onto enough water, so it drips.
It will also decompose and stain everything brown or black.

Maybe coat the saucer with wax or so.

You could maybe switch to something based on sphagnum moss or coco with a bit of perlite. They will be more inert and hold more water.

The plant choice you made couldn't be better! Those succulents will be very strong and survive everything.