I am not sure how many of our customers are aware of that, but Lightburner maintain online your full uncensored stock portfolio.

The link is always like this: http://lightburner.com/u/<your-lb-username>

For instance, take a look here http://lightburner.com/u/stockyimages or here http://lightburner.com/u/diegocervo to get a feeling how it looks.

Your client can look on your entire archive and select a picture they want.

Send them a link and open yet another sales channel for your artwork!