yes looks can be deceptive..many a times you see a person who looks good but as he\she opens their mouth ,.you realise that your first thought was not very right.
1.The person is appearing for an interview
2.If the person is an actor
3.If the person is an airhostess/cabin crew
4.If the person is a graphics designer
Because in all the above cases if you see the above set of people without their make up on, you will get terrified!!!!
Graphics designer design their own face to be flawless like using adobe photoshop