"Drawing is a kind of hypnotism: one looks such a way in the model, that he comes and takes a seat on the paper."
What makes us all different when we all have 2 eyes, a nose, mouth etc? Its the shape, the light and white that define each unique expression or feature and as a result, each unique character.
The younger the subject, the less time life has had to create the creases and crinkles of experience. There are, however, distinctive and yet so subtle nuances to be found that make each an individual.
Thank heaven pets can be recognised quite simply by their breed, however, within each breed, each animal is still unique with their character illustrated through their colouring and attitude.
Architectural styles and features differentiate every building. What brings a building to life is the play of light and shade on these features and a choice of focal points to highlight and emphasise their uniqueness.