How can I share iCloud Photos on iPhone?
iPhone 13 Pro
You have lots of choices. The easiest way is to select a picture and choose Share
and choose Messages or email or AirDrop. See this;
Share photos and videos on iPhone - Apple Support
You can also create Shared Albums:
How to use Shared Albums in Photos on your iPhone, iPad, and Mac - Apple Support
I like Shared Links
Share photos and videos with an iCloud Link on iCloud.com - Apple Support
Is there something specific you are looking for?