A practical workflow is to use preprinted cards with unique access codes. For each new subject, photograph the card first, then take their portrait, and hand them the card. Later, you can match the code seen in the card photo to that person’s images.

Why this works:

• no need to collect much personal info
• fast interaction in the field
• easy photo-to-person matching afterward
• unique codes prevent people from browsing others’ portraits

You can make the cards sequential, or better, use randomized codes so people can’t guess other galleries. If you want a simpler system, sequentially numbered cards can also work by matching them to your camera’s sequential file numbering, but randomized codes are more private and don’t depend as heavily on strict order.

Delivery can be as simple as asking them to email you the code, or you can set up password-protected online galleries/web pages tied to each code. If you’re comfortable with basic scripting, a small web tool can automate retrieval and display from your photo hosting service.