I have to agree with you. She looks a bit better on another photograph but still, nothing to compare with Zinaida Yusupovna.
But as I wrote earlier, Felix S-E did not care for a beautiful wife always busy with parties, he wanted a tender and loving wife at home. He was a soldier...
And interestingly, he remained in love with her until his death. he wrote letters to her twice a day or more. Everytime he had a break he would find a piece of paper and write to her.
So what s the point of being beautiful if your husband is not attracted by you ? :-)