How to show samples of art photos to prospective buyers

[kwcalm]

How do professional photographers who want to show their work to prospective buyers provide
 versions of the photos online, by DropBox, or email.

The buyers need to see a beautiful image online, but not be able to download an image to make their own 'quality' print.
I don't want to deface the photos with a watermark.

The photos are edited in Adobe Lightroom.

The originals are RW2, with resolutions for example 3968 × 2232

What is the best way to do this?

Thanks.

[Jill_C]

I use Shootproof, which allows you to create beautiful galleries and slideshows and facilitate paid or free downloads and also print ordering from high quality labs. A plan that allows you to have 1,500 images uploaded to galleries at a time is only $100 / year. They offer a free 14 day trial. 

https://www.shootproof.com/

SmugMug also offers an array of plans, though their plans which incorporate commerce options are more expensive than Shootproof. They also have a free 14 day trial.

https://www.smugmug.com/plans