Congratulations, this is such a good perspective on huge. The people are like ants and certainly show how big this cliff is. This is not only beautiful but it meets the Challenge perfectly.
This is one of the very best photos of the white cliffs of Dover that I have ever seen - worth submitting to a photo agency if you aren't selling fine prints. Really impressive!
Edit: I see that these are the Seven Sisters - my comment still stands - a thoroughly impressive photo. You have acptured the scale so well.