Agreed about the smudge. For me her skin and eyes are a little washed out, but otherwise a strong, powerful statement.
That 50/1.8 is a good little lens, sharp and fast. Mine's a second hand pre D one that i've had years, have dropped etc and is still going strong, though i hardly ever use it.
Silas, you appear to have so many women in tow that I'm surprised you can remember their names ;-)
Great expression and extremely strong composition, though if you'd seen Don't Look Now you wouldn't want to be alone with her... My only suggestion is to clone out the smudge on the wall. Not to tamper with reality, just to stop it taking the eye off the laydee. Tim
