Because people are visual I'll give a demonstration. 

nostr:nevent1qqswks9dsnyg89nyayjvjs4aakr6c7krcapf8kvewn9yz769uwe49pgpzdmhxue69uhk7enxvd5xz6tw9ec82c30qgs0p7e36xqs48u4mu730r7dvl9qkzv8ntg3ap5fu45k9nvrn7uw44qrqsqqqqqpddk4wy

In most situations when you underexpose an image it blows it all the white and you lose details in important places. Things begin to feel cartoony. 

https://image.nostr.build/8bff437cd6f2501ed5e97e806d5fff61bc4e6bfe88968e0cde6156399371b0a7.jpg https://image.nostr.build/c396f849d184d72776e6f2ee98230d90741311f57bc43b2db9d8521d2c54ef90.jpg https://image.nostr.build/36377d21eb6f1f5581e120bec242aaacc9c5cd6b2dbc06d021fb99122920dd31.jpg https://image.nostr.build/6a6fe4380d3f23d8e9b728d8b9d70b18f40e4093d8acc98204a17902255def2d.jpg

Most people including beginnings photographers would shoot looking for the skin tone 18% gray blowing out the whites but leaving rich blacks as sort of a middleground and that typically works in most applications. But for a wedding photo it's actually kind of better to make everyone look dreamy like that. 

It could've been this🤷🏽 https://image.nostr.build/856585a7635a9ae56999d89686c7c63bf22bcb0515d8ea1a3614c8316db01d3e.jpg but notice how now it looks like her best friend took it with her cell phone🤷🏽 https://image.nostr.build/0afce8c8e4fb86e75ebea815bd7a7796ae74777ba8dae23b66350beb750cf718.jpg

Like I said. Certain situations. Certain feels. 
https://image.nostr.build/fb2a321b614d7cac43c8fbcdda79d442e6975ef7b48a650ca64dd82dc399624f.jpg https://image.nostr.build/aa2f3ac96666b492eb6baf11626c257a2f7af028f430817134f4c8dc6cc26ab1.jpg https://image.nostr.build/d1306148b9decd5b19ace893176eade13014594b4747bff1c8241bcb7e8a3d1b.jpg 

 What a trip! The darker one is so weird lol 

 Exactly 

 Here I was thinking it was a good photo because of me 😂😂😂 

 Well you make it easy. But the photographer knew what they were doing.