Yes, Maria seemed to have been the most sensitive (of her own feelings and those of all others, no matter what rank) of the sisters, and the kindest -- both traits of true beauty, as opposed to the shallow kind.
As a person with a strong interest and background in art history, I certainly am captivated by the power of images, including those of beauty. But it is what those images represent that matters, and is what is ultimately beautiful, or otherwise.