Hypernatural has dozens of pre-made styles to suit your videos, whether they're photorealistic (like Photographic), highly stylized (like Vaporware and Game of Thrones) or hand-drawn/cartoon-like (like Watchmen and Pencil Drawing). If you'd like to make something even more customized, you can also create a Custom Style.
The Custom Style generator is available in the bottom right on the style picker page. You can upload an image to define how your style should work and then edit the generated description to get it just right. Here's an example of a video with a water color style made with a Custom Style