Just wanted to pass along a couple of tips, maintaining a constant ROD until the flare height is a good practice, have seen some pilots doing a duck under when close to runway, usually ends up a long floating touchdown. On flap 3 approaches the picture can fool some people into flaring too high and will also float. One other point is to pick out a point during the flare down the runway, this will help you from flaring too high.
Happy Landings, DL