On the web at Behance.net:
To look at who’s seen your Work in Progress on the web, open your own Work in Progress in the strip. You’ll see a blue button on the bottom left corner of each segment indicating the number of views. Click on the blue button to see the number of views, types of reactions, as well as the usernames of the people who have seen each photo or video in your Work in Progress.
Only you are able to see who’s viewed your Work in Progress.
Using the Behance iOS app:
To look at who’s seen your Work in Progress on the app, open your Work in Progress in the strip and tap the grey button on the bottom left corner each segment indicating the number of views. Swipe up on the screen or click on the Views button to see the number of views, types of reactions, as well as the usernames of the people who have seen each segment in your Work in Progress. Alternatively, once you open your Work in Progress from the strip, you can swipe up on a segment to see who has viewed and reacted.
Only you are able to see who’s viewed your Work in Progress.