Agree with Wendigoskin. Generally, I find the most effective & engaging description of a character in fiction writing is that which occurs throught the eyes of the protagonist in the story- that is, the chief character says something like,"her shape reminded me of a girl I had a crush on in high school" and then you leave it at that for a while. The reader then has to imagine what that girl looked like, by drawing upon their own experience. You then add details as the characters interact and this keeps the reader engaged and invested in the process. See the works of Raymond Chandler for examples- he was a master of this technique.
The WORST way to do this in my opinion is the omniscient viewpoint, in which the descriptions of characters are provided explicitly by the author. That hack adventure novel writer Clive Cussler did this by habit in his books, and it is a cheap, crude and juvenile way of writing. The result bears the same relationship to real writing as kool-aid does to fresh squeezed fruit juice.
-latecomer
It depends on whether you're interested in pure physical inflation or also in the psychological characterization of a character.