Thinking about how Ranni probably hated her own body because it made her nothing more than a puppet for the GW. And that’s probably why there’s no depictions of her anywhere in the game (I wouldn't be suprised if she slowly got rid of them all before deciding to revolt completely), and why she decided to make her new bodies in the image of her teacher instead of herself.
Because any sight of her previous body would be a horrible reminder of what she was.
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Edit:
To add onto this, Rykard obviously loved his sister as he was willing to fuck with Maliketh just because it would help her, but despite this there’s no depiction of her in volcano manor. Only ones of himself and Radahn.
Soooo he obviously cared for his sister and also obviously cared for these grand displays of affection/family power or he wouldn't have had these portraits made, so why wouldn’t he also have a picture of her? Well I can only assume it was because she didn’t want one.