What do you think of when someone says “handsome”? You might think the classic (tall, dark, and handsome), but I think many of you are thinking. “A blond with blue eyes!” This is a good example of describing the characters. If a writer just says “handsome”, the reader has license to put a face with that description. Some readers will picture a blond, others will see a brunette. The writer can either leave the details to the reader or add them into the book so the reader sees exactly what the writer sees.
I would rather do the latter. I want my readers to see the exact description that I see in my mind’s eye.
There are some writers who are all about the actions in the book. What will happen next? How will the mystery or adventure be resolved? I like to add the descriptions of the characters, their feeling, and the descriptions of the scenes I am imagining. To me that makes the story more believable.