100% of the whole whale
Perhaps the WCDS could pursue a sponsorship deal with a leading manufacturer of large-screen plasma displays. The screens will carry a legend stating that they can display such-and-such a percentage of a blue whale that is floating a certain distance from the camera. It will be the whale percentage/distance ratio. Current screens can only show a tiny portion of a blue whale if it is nearby, or a complete blue whale only if it is far away. The eventual goal will be to produce a screen large enough to display an entire healthy regular-sized adult blue whale, from a distance of one foot, without scrolling, with a little bit of a border to account for the whale's undulations.
I add all these qualifications because I envisage the manufacturers cheating in little ways, e.g. by using the blue whale equivalent of a size zero model, or by photographing the whale only when it is breathing out, or has just gone to the toilet or given birth, etc, and is thus smaller than the average whale. Or by using a similar but smaller race of whale.