There is a unrealistic thing with this "falling particle"-effect when you're landing very gently on earth.

It's a little bit difficult to descripe, you can reproduce this effect when you:

1. Start flying in creative mode
2. Fly high, for example 80 blocks higher then your start location
3. Fly down to ground and stop flying right bevor you'll land
4. Now press your shift key (for going down) very gently until yuou will land and yo'll see a huge particle spread.