WhySoTough, you have been given lots of advice in the previous posts, much of which is valid. However, some aircraft due to the undercarriage geometry require a slightly different landing technique.
The Airbus A-300 (B4) was a classic example. After arresting the decent and flaring in the normal manner a slight forward movement of the control column was required to achieve that smooth touch down. The Boeing 727-200 was another example.
Another consideration is seating position, you maybe sitting too low. Most large jets have height of eye indicators which are there for a good reason, and don't be shy of asking for advice from the captains that you fly with, or better still talk to your company instructors.