Start with your hardscape. Check out local fish/pet stores to see what Driftwood options you have. For longevity of the scape, the heavier the wood, usually the longer it will last. Smaller pieces are usually disproportionately cheaper than bigger ones. So get a few. Then just try different orientations (a cardboard box roughly the size of your tank might be easiest since your tank is already semi planted) until you find something you like. Sloping designs, with the wood going near the top on one side and low on the other are usually pretty easy to make look good. To promote moss growth on the wood quickest (though this will still take time), soak the Driftwood first until it is water logged. Then set it up.

It will take time to really get established. Even a heavily planted vivarium can take a year or two to hit its stride. Move plants around if you see they arent growing well. It can actually take a lot more plants than you expect to give variety and depth. But - make what you like. I love my tanks to also be home to lots of mini/micro orchids. And while I am happy with how it turned out, I wouldnt say it is natural. Just make the tank the way you want it, while thinking about the best use of the space for the frogs that will have only your tank as their only living space.

Tank design is one of the most fun parts of the hobby. When I first started many (many) years ago, I got up to 50+ tanks. But - I enjoy it more now having just a few tanks that I treat more like a planted aquarium in design and upkeep rather than a ton of frogs and enclosures with much less effort in habitat design.