Welcome to Konigs Starter Tips, some simple things to improve your builds and make things more pretty.
1. Allways, allways, ALLWAYS try to get the elevation near the path and the path itself done as soon as possible. Nothing sucks as much as putting alot of work into it, finding one spot you dont like, for an example i had a moat for a habitat but there was a small bit that wasnt terraformed correctly and still stuck out of it because i allready put in the path. For this example to fix one tiny thing i used up allmost 2 HOURS of deleting, terraforming and trying to build the path again to get my path to line up again with the custom fence i build. It was quite the pain, so really try to finalise your path and all terraforming near the path rather early and defenetly before you actually decorate it.
2. What makes a good habitat? A good fence makes a good habitat, or rather a nice surrounding makes a good habitat. Want proof?
As you can see, the habitat is allmost completly empty, but the fact that i decorated the front and back of it makes it look great regardless, because even when the habitat itself is plain the view isnt and is beautiful. This comes in handy in multiple ways, but the number 1 things are traverseable area and filling the ground. To be frank, traverseable area sucks in this game, so what you persume as quite the sizeable habitat can quickly be cut down a LOT from decorative items, so moving most of them behind or in front of the habitat and therefor out of the traversable area allows for smaller habitats with more room for the animals then much larger ones where the inside is decorated, which should be especally helpfull in challange mode. The larger the habitat the worse does this work though on its own, sooo...
3. Break up the view by placing bushes, trees stones whatever as centerpieces in the habitats in clutters. This has 3 purposes. 1. You got something that distracts the eye from the plain nothingness in the middleground, 2. Makes it that not every part of the habitat is visible, aka making it look smaller and therefore easier to decorate and 3. it helps to destress animals and get them away from the visitor. You can even go so far and add backstage parts to the habitat to create more space to fill the space requirements and help decrease stress on the animals, an example for okapis, which are rather stress sensitive is here.
As you can see nothing fancy but thats exactly the point, but another thing you can see nicly here is...
4. Use the hell out of Dins Grass, Buffalo Grass, Flowers and Faux Rocks. These guys are Lifesavers in regards of making the ground itself prettier to look at. Only down side is that its worse for the pc performance then the paintbrush grass, but its also just way prettier AND does not despawn from far away. The flowers are part of the conservation pack and faux rox parts of the aquatic pac, but the grasses are both part of the base game.
5. Try sinking things into the ground. Sounds silly but often rocks and plants look better atleast partly submerged, especally in regards to creating bushes. As a confession, i allmost exclusivly use tropical plants for tropical houses and temperate and taiga plants from europe and asia for everywhere else (cause yk, european zoos are what i know) and while bramble bushes are nice and are frequently used, my most used bush is the beech sappling submerged. Looks beautiful, especally mixed with bramble bushes and oak sapplings and submerging it for the first time was unironically one of the most important moments for me learning the game.
And lastly 6. Use elevation to create panorama shots. Simply, a nice habitat is pretty but wouldnt it be a shame to be seen from one place while looking at this habitat? That obviously can work, but arranging habitats in a way that they are visible at the same time, becoming forground and/or background of other things, thats when a zoo really comes together and makes the habitats work synergisticly in making the view more then just the sum of its parts.
To showcase, have a little pic series from my favorite spot in my zoo.
Not the biggest transformation, but 2 rather simple looking habitats become much prettier now that they are combined, neat isnt it?
Thats it for now, if you want more tips just ask for it, im not the greatest builder out there, but i know enough simple stuff to make if you ask me some really pretty habitats ^^