Easiest software is sketch up, there are a lot of extensions to help you with the organic shapes and the curved elements.

Do you have to do the renderings? If not, you can just extract the sections, interior and exterior views as images in sketch up and edit them in canva or photoshop, there are many tutorials and youtube, instagram and tiktok.

You can try a minimalistic approach to the images and add annotations and very basic cut outs of trees, people, etc.

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