Preventing high quality photos from being downloaded from a Website

We want to post samples of our photos on a WIX website. We want the visitors to the site to be able to see a preview, and click to see a larger version.

We don't want the visitors to be able to download a quality copy.

The photos of the originals are 4000 x 2200 Pixels 
We have reduced the web versions to about 2000 x 1125.

Can WIX be configured to turn off the download option?
Are there websites that WIX could link to that would prevent a download?
What's a good resolution to use for the posted photos that would capture the quality of the photos, but not be so good as to prevent the visitors from downloading a quality version that they could distribute in an unauthorized fashion, to be printed or posted elsewhere?

Thanks.