That is a sad photo. I would think there would be some more photos, but perhaps not. He may not have been thought important because he wasn't heir to the throne, so less photos. Or perhaps they are just in the archives somewhere. But if, at his death, they had to do what that biograohy says, there were no other photos of him, though it seems a bit strange to me, as well. If Alexander had lived, perhaps things would have gone better. It also strange that some biographies have him born before Nicholas rather than after.