Can't send photos from my iPhone 5?

I have the iPhone 5, IOS 8. I'm with sprint. I can't ever send a photo over iMessage.
I don't want to have to send it through anything else. Why the f doesn't it work like it should?

Why not go into Apple as they are good at helping us all out I to have a iPhone 5 with IOS 8 and I do not seem to have a problem sorry I do not know much re sprint so I hope you get sorted out soon.