You can snap pictures and submit them all within the app. MoWeather also has a very nice idea built in -- with a click, you can email or text a map of your location and the current conditions to a friend.
The app also supports gestures. You can swipe vertically to update the current conditions, or swipe left to see your locations list.
MoWeather for iOS
I live in a pretty small town, so I didn't see any submitted photos, but larger cities around the world have a nice selection. My only gripe is that the weather photos should be a background to the weather stats as Yahoo Weather does it, not a collection on a separate page. Also, some towns' weather photos are a couple of days out of date, but the more people that use the app, the better it will all work.
MoWeather is a very nice new member of the "free weather app club," and after testing it, I'll leave it in my weather folder for future reference.
MoWeather requires iOS 5.0 and it's optimized for the iPhone 5 series.