You see a triangle between index finger and thumb which is perfect from muzzle, chin and jaws up to the ears. Head between large and open ears is slightly flat. To have an excellent expression slighty slanting almond shaped eyes lie in the triangle. These facts build a perfect Siamese head.
When ears are placed too high triangle miss its expression; shown with next picture.
Also too high placed ears semms to be smaller so head expression becomes more round.
Another impairment from harmonie of head is a slightly stop above muzzle. This is known as "PINCH" and shown on next picture.
In spite of pressing muzzle and hair this stop will remain. The head seems longer thru "PINCH" but expression of cat is more careworn.
Itīs a strong error when eyes lie deep. This happen mostly at "extreme Siamese" but could happen to all others too.
The eyes be effective small; seems that the cat couldnīt open eyes completely. Deep lieing eyes happen almost together with "PINCH".
The perfect profile is shown with next picture; it shows a correct nose profile and forehead of Siamese.
Noseline (1) is completely straight - no stop or rise. The forehead (2) is flat and shows a straight line.