Re: description
I agree with James' assesment. I rarely do descriptions, unless I can just slip it in without anyone noticing it. I find most descriptions overlong and boring, like a list of traits, and it does *me* no good, because I always picture whoever I picture in my mind when I read it. Why clutter it up with constant references to "His hair was brown" when the guy I see in my head when reading it very obviously has blonde hair.
However, I think Raymond Chandler did it best in the first paragraph of The Big Sleep:
It was about eleven o'clock in the morning, mid October, with the sun not shining and a look of hard wet rain in the clearness of the foothills. I was wearing my powder-blue suit, with dark blue shirt, tie and display handkerchief, black brogues, black wool socks with dark blue clocks on them. I was neat, clean, shaved and sober, and I didn't care who knew it. I was everything the well-dressed private detective ought to be. I was calling on four million dollars.
And that's all you get from Phillip Marlowe, P.I. throughout the entire book. Look at how much he tells you without telling you.
First and foremost: He doesn't normally look like this. Being "neat, clean, shaved and sober" is an event for him. So you know his default appearance right off the bat.
Secondly: Since this is a pulp novel, you know right away that the hero's going to have a hard jaw and a little bit of stubble. That's a given. But you know from his line "I was everything the well-dressed private detective ought to be", that when it comes down to it, Marlowe can take care of business.
You find out later that Marlowe really IS a catch with the ladies, in much the way that James points out. After depositing one drunk sister who's just spent the better half of the hour trying to get into his pants off at her house, he comes back to his apartment and finds the younger sister naked, in bed. "The Sternwood girls were giving me both barrels tonight..."
If you're good, the reader will figure these things out without you having to tell them.