It really depends on how important the physical description is to the character and the advancement of the plot.
For example, Lestat is described in detail by Anne Rice because his beauty is an essential plot point and intrinsic to his personality.
By contrast, the main character in Choke is only vaguely described (if I'm rememebering correctly) because his appearance is relatively unimportant.
Heinlein used this to great effect in one book by leaving the description of the main character out until about half-way through and then having it revealed that he was a black man. This shocking revalation that the reader had been living vicariously through a black character they had thought was white was huge to the time period in which it was published.
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