How to get newest wallpapers for iPhone

Hello Aalbafrepa_67, you can do that by going to your settings;

1. In the Settings app, tap Wallpaper.
2. Tap Add New Wallpaper.
3. Tap Photos, People, or Photo Shuffle to choose your own photo. You can also select a wallpaper from a category like Weather & Astronomy, Emoji, Collections, or Color.

OR for more guide, you can follow the link I'm sharing with you below.

Change the wallpaper on your iPhone - Apple Support

Update to the latest iOS version, if it doesn't appear like that probably they're exclusive for the new iPhones. you can try to search them on the internet