"Down to earth" is the opposite of "has his/her head in the clouds." I can't find my earlier posting :( but recently I gave this example: Head-in-the-clouds person: "Look how bright the stars are tonight! Do you think someone on a planet up there is looking down at us and wondering whether there someone here looking up at them?" Down-to-earth person: "I don't know, but the mosquitoes are starting to bite, let's go inside." Another example: "So, in another year we should have enough people that this will not be a problem." "Good, but to get down to earth, what do we plan to do next week?"

Yes, your definition is correct. A down to earth person is someone who can along with anyone...it doesn't matter if the person is rich, poor, homeless, etc.... Humble & pratical are fantastic synonyms !

Yes this is correct. I will put it in simpler words for you. Down to earth: Relaxed, kind, confident, and doesn't react quickly to something negative.

Means someone humble, practical, reasonable, natural and friendly

The person is fun and easy to get along with