Question

Hi Angus

Answer

Hi Mark,

Great question. An iPad would be the most user friendly for the customer and long term cost effective.

Hardware

iPad (10.2" to fit stand) - $496
Studio Proper Powered iPad stand - $250 

Services

Take your pick: a shared album link from Google Photos, iCloud Photos, a shared folder from Dropbox or any public website link.

Software configuration

Step 1: Follow the welcome wizard to setup the new iPad

Connect to WiFi and setup a separate Apple ID that's not connected to personal/work accounts.
If it's an existing iPad, I'd suggest backing up and doing a factory reset to wipe personal/work data.

Step 2: Use a passcode to secure Screen Time settings.

1. Go to Settings > Screen Time
2. Tap on Use Screen Time Passcode

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Step 3: Restrict iPad to the Google Photos shared album

1. Copy the Google Photos shared album link to the clipboard.
2. Go to Settings > Screen Time > Content & Privacy Restrictions >  Content Restrictions >  Web Content > Allowed Website Only
3. Paste in the Google Photos shared album link. Give the link a name.

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Step 4: Guided Access keeps the iPad in a single app and allows you to control 

1. Go to Settings > Accessibility > Guided Access > turn on Guided Access. 
2. Open Safari and triple click the Home button.

[Optional] Step 5: Keep iPad screen always on

1. Go to Settings > Accessibility > Guided Access > Passcode Settings​
2. Set Guided Access Passcode
3. Open Safari
4. Enable Guided Access: triple-click the Home button
5. Bring up Options: triple-click the Home button again and enter your passcode
6. Turn off the Sleep/Wake button.