We marbled a little fondant for the waterfall and disguised the source with fondant rocks. As a side note, if you want some AWESOME looking candy rocks and boulders that are solid chocolate covered in a candy she'll, check out Nuts.com. I love these people, their almond flour and their cute packaging.
There are a million animal tutorials out there, so I can't add much new in that department. The most important thing to remember is to add tylose to your fondant and let it sit up a while. This step will make your animals not be droopy or melty looking. Another tip is to add a little "makeup" to your animals. A little touch of blush will make your animals "come to life"! Also, if you get the basic way of making an animal, you can search Etsy for an "elephant" and take some inspiration from a greeting card, stuffed animal or most anything. If you are selling a cake with animals, you should allow about two hours to make each animal. I'm just saying, don't start the animals at 8pm the night before the cake is due. Happy animal making!