Describing a person means that you should describe someone from at least two aspects：
apperance and personality ( maybe character).But this is hard work if you lack of English vocabulary,especially for apperance.There are so much many english words for each part of the body(maybe physical).For instance,there are serveral face shapes：round face,square face,oval face,etc.The face is the most important part of describing a person.Except Besides facial shapes,there are also much many other words used to describe the face:'good looking','common/average looking','ugly',etc.
There are also parts of the face to consider,such as eyebrows,hair,eyes,ears,nose,lips,beard,moustache,so much.Also,there are so many adjectives for each of them.