What is the best way to collect photos from clients for their social media posts?

Do whatever is easiest and smoothest for the client. You can collect pictures with a form, or the client can email or text them, and Votel lets you communicate with clients by SMS or in the app.

Email is the better option for photos, because depending on the carrier, photos sent by text may be compressed and not look as good.

The less work for the business owner the better. If you are turning their reviews into social content, consider taking them out of the loop entirely: gather the reviews and images yourself and make them look good, unless you need something only they can provide, such as headshots.