The image above happens to be centered. The caption also has a link in it, just to see if it does anything funky.
And now for a massively large image. It also has no alignment.
The image above, though 1200px wide, should not overflow the content area. It should remain contained with no visible disruption to the flow of content.
And now we're going to shift things to the right align. Again, there should be plenty of room above, below, and to the left of the image. Just look at him there… Hey guy! Way to rock that right side. I don't care what the left aligned image says, you look great. Don't let anyone else tell you differently.
In just a bit here, you should see the text start to wrap below the right aligned image and settle in nicely. There should still be plenty of room and everything should be sitting pretty. Yeah… Just like that. It never felt so good to be right.