S100/3.5 :: Lens Carl Zeiss Sonnar T* 100 mm f/ 3.5 C/Y - test photo taken via a Canon EOS 300D (6Mpx)

This illustrates the ancient principle of placing an important element at the crossing of imaginary lines dividing the image into thirds. In this case, the model's right eye. The next time you view works of the masters, see how attention is placed on the most important figures by placing them at the critical junctures of what is known as the Golden Section or Golden Mean. In the single subject portrait, the eyes hold our attention and doubly so if one or both are placed one-third down from the upper margin and/or one-third over from either right or left edge of frame.

I like this lens so well, I'm adding it to my little kit of Carl Zeiss C/Y primes which I shoot via an adapter on a Sony a7R. Hopefully, I'll have some samples which may approach this level of excellence. I've been a photographer and artist for over 75 years.