When learning landings as a student I had a lot of trouble estimating height above ground on flare and hold off.
Was told imagine a double decker bus,imagine a first floor bedroom window,none of which clicked for me.
Then some wise old bird told me to sit in the aircraft on the ground for a while,peer around and see exactly what it looks like.
This really helped me in my early landings period.
Doesn't always guarantee perfect landings though(could this be me?)
Lister