Once you are lined up just prior to take off, note the picture with the student (and even have a picture of it in the briefing) pionting out a feature, maybe a tree, to keep their focus on the horizon not the spinner. Tell them that the landing is just flying level, with a gentle sink towards the runway - whilst holding the picture burned into their memory.
Flying level - flare
Holding the picture - hold off.
It is then just upto them to suddenly 'get it'. The trick is to know when to say nothing and when to gently guide. The more relaxed you are, the better they will pick it up and enjoy the landing experience. I find this the best part of instructing - and I don't get the time to do alot these days - well that and wing-overs, dynamic stalling with full power and full flap, cloud dodging, ultra-low level, early turns into the circuit at 50'....you know the stuff.