This is a picture of me diving down from a high height. As you can see, the world is a simple world with grass, snow, trees, etc.
The problem here is the 3D foliage. If is obviously just "jumping" into the scene. It also changes the scene dramatically - Instead of simply adding detail to the "current" scene, it's effectively overwriting the terrain underneath it and setting it's own colours/details.
Yes, you can see the 3D foliage appearing as the player gets closer to it. However, it is very hard to actually focus on how or where it is appearing. Also, the grass adds detail to the terrain, rather than completely overwriting it and providing a completely different picture.
The TL;DR on this is - My game has grass that "pops" into existence and creates an obvious change in the terrain, whereas professional games have unobtrusive hard-to-notice geometry gradually fading into view.
How do other games do this, and how can I implement it?