Here is how to know in easy ways if you are contouring the wrong way... watch and learn!
Contour can go to far! Naturally contouring is supposed to cast 'shadow' of parts of your face (and vice versa with highlighting).
Sometimes ladies take it a bit too far leaving the finished makeup looking funny. In the end, make up is made to enhance not recreate your features hence the need to go subtle with products.
If you are not sure when you are crossing the line with 'Contour' then watch this video to know.