If you think about it, we're all characters in our life's story. We are more than a collection of physical attributes such as height, weight, hair color, and race, etc. In varying degrees, we have strengths, preferences, fears, and emotions that shape and affect our behavior. We have friends, relatives, colleagues, and neighbors interacting with us on a continuous basis. We have religious preferences, intellect, psychological attributes, family history, illness, and financial pressures that combine to make us unique. To summarize, real humans are incredibly complex.
If character descriptions in your book only concentrate on physical attributes, your characters appear to the reader as superficial iconic-creatures that you drag from one scene to another. If this happens, your readers will not emotionally connect to your character and you'll get minimal backstory to support the central plot.
The author's task to develop meaningful characters is more difficult than a movie casting director's job. The casting director chooses from real people who understand life and bring their talent to support a play or movie. The author not only constructs the physical attributes but all relevant attributes that are necessary for that character to function during the course of the entire book.
To create fully functional characters, an author should develop a detailed character profile. This is a very time intensive and laborious task, but if done properly it serves as a ready-reference when you begin working on the manuscript draft. It also helps you keep the blue eyes blue on an early page when the character is introduced and a hundred pages later when the eyes are mentioned again (perhaps in a love scene).
There are lists of character attributes available from reference books on writing craft or I could create one here, but those lists would not be your list. It is essential that you understand the importance of a character profile and create attributes that are best suited to your character's role within your story.