Everything has definitely gone wrong. The idea is good but you need to work on your cutting out, color matching, and blending images to make them look like they are part of the same picture instead of looking like a collage of random pictures put together.
The lion has a missing foot for a start. You either need to add a foot or place something like a shrub over that straight line to hide the fact that the foot is missing.

bright happy!

Thank you Author.

No, the land source you have given is a brown field, not the golf course and river.

Thank you author, almost done, the first source "land" is not linked to the correct image.

Author, please link the source images to the picture and information page where the copyright and usage information can be seen.

Here is the one for the koala: https://www.pexels.com/photo/gray-and-white-koala-bear-near-trees-105823/

Please ensure this is done for all of the source links.