This is my final edit and render of this scene. Thanks to everyone who gave good feedback and advice. I’m very happy with how this has turned out now.
In order to fix the scale issue, I scaled down some of the plants (even though originally I wanted some giant plants), added a snake and a tanning rack, as well as made the doorway more human shaped. Hopefully, these things can now make the scale more apparent.
I didn’t adjust the contrast, but I made the sun more yellow than before.
Thanks again to everyone who offered useful advice.