You need to isolate.
Looks like a bunch of your wife's decorative rocks, in a dish, on the railing of your deck.
If that's what you want, you nailed it.
What's in your mind's eye?
Much like anything in life, you should have a vision of what you want to see then go for it.
In my opinion, I'd want to see some light painted long exposer photos of a few rocks by themselves. I'm a fan of odd numbers, so 3 or so.
A solid dark color to lay them on, maybe something small to prop them up to give them some dimension, but it's blocked by the rock so you cannot see it.. etc.
Doing some bulb, or otherwise long exposure shots will give you a better grasp of light and how if gives dimension and definition to photos. Since you mentioned trying a few different modes with the camera.