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The picture being sideways is because that's the original orientation of the picture. It was taken sideways. Some software, such as the camera's software, knows this and will adjust the picture to display correctly. Some websites will do the same. CorvetteForum does not do this.
You will need to either take the picture in the correct orientation or use a photo editing utility to rotate the picture. You could also post the (original) picture in a reply to this thread and we might rotate it for you.