I have an acronym for you:
DEP - Design Eye Point.
This is the point at which all pilots' eyes should be in order to avoid parallax error on mechanical displays (also, it is within the tolerances for LCD
displays). It also means that, from this point, all vital controls and displays are visible.
In the documentation that I've seen for some civil aircraft, this is translated into a, "Design Eye Range", which is a small area (a couple of inches cubed), in which the pilot's eyes should be. Remember that, for military aircraft, we're now designing for people at least in the range 5'1" to 6'3" (154-191cm) (5th percentile female to 97th percentile male, using UK military pilots (male) or personnel (female), as defined by Def Stan 00-25)
In theory, this means that all pilots should have the same visibility, irrespective of whether they are below or above average height. The taller pilots should, in fact, lower their seats in order to make sure that their eyes are at the DEP or within the DER. Everything else (e.g., pedals) is adjustable so that you can achieve this.
It should also be noted that, when you first sit in the seat, you tend to sit upright, with a straight back. However, once relaxed, your eyes drop by to 2-4 inches (5-10cm). This means that, when you set yourself up in the cockpit, you MUST do it from the position in which you will normally be sat, not in the position that you think that you 'should' use. Just to confound matters, your spine shrinks by up to 2 inches (5cm) over the course of the day. This isn't too much of a problem for your average Spamcan pilot, but it may/will have an impact on long haul pilots.
Many aircraft (particularly in the military world) have a couple of markers on the side and front of the Main Instrument Panel and on the side of the windscreen, in order to help you set up the correct position.
While this isn't too important during the cruise, it does become very important when you start thinking about Head Up Displays, not only for bombing runs (using CCIP), but also for Enhanced Runway Recognition (EHR) and other civil references to the outside world.
I should also note that aircraft manufacturers are not great at pointing this concept out to users. In addition, flying instructors aren't 100% reliable for passing on this information.
So, ask your instructor what is the DEP. If he/she doesn't know (and there aren't any markers or helpful tips in the manual), write to the manufacturer.
As a last point, the view out of the front is (usually) only good for assessing your position with respect to the centreline (and spotting obstructions). Your peripheral vision is much better for assessing your speed (with six degrees of freedom). Therefore, assuming you are set up correctly on the centreline before entering the flare and you have correctly assessed any crosswind, your peripheral vision should be more than sufficient to assess and provide inputs to your landing manoeuvre.
The definition of a 'Pessimist': an Optimist with experience...