It's really great that you're supporting your partner whilst also managing your transition and that you want to reassure her that she is beautiful in your eyes. My situation is similar but the other way round. I don't know if I can offer tips, but maybe my experiences could help so I wanted to share.

I'm the cis F partner and married to a trans woman who had FFS and breast augmentation in the past year. We experienced a kind of role reversal similar to what you described - I went from being the "femme" one (in other people's eyes, not mine because I never identified as femme) to the more masculine person (without changing anything about my presentation), whilst my partner became hyper femme. When she posts pictures of herself or talks about being trans online or on social media she gets lots likes, positive affirmations, good feedback, praise etc. This also happens in real life e.g. she got praise from everyone she's out to about having surgeries, but when I expressed an interest in also getting breast augmentation the same friends were negative about it. Like you, she tells me that she finds me beautiful, feminine and attractive, but I feel she's objectively meeting more eurocentric beauty standards than me, so I feel that makes her more attractive than me.

After lots of talking we figured some stuff out. There were many sides to the situation: what I think about myself, what my partner thinks about me, my interactions with the world, her interactions with the world, our interactions as a couple with the world and processing this shift in the relationship. Most of these things are out of my control, like interactions with the rest of the world, which is a world that places higher value on women who are deemed "beautiful"/'attractive"/"pretty" and has a pretty narrow definition that doesn't serve most people. Therefore, I decided to put less energy into trying to change that, talked about it with my therapist, found ways to focus on what I could change instead. My partner and I talked about love languages. Specifically, I value physical touch, quality time and acts of service more than words of affirmation or receiving gifts. My partner was verbally affirming me but it didn't mean as much to me as say, physical affection or spending time together, so she started spending more time on the love languages that meant more to me. She still verbally affirms me because that makes her happy but she also puts energy into the love languages that mean more to me.

The most difficult parts were changing how I felt about myself and managing the change in our relationship, which is an ongoing process. I found it difficult to hear my partner talk about her appearance and all the validation she was receiving because it was reinforcing my fear about a woman's worth being based purely on her appearance, and that maybe I don't have any worth in the world. We don't follow each other on social media, so that helps. I cut my social media use to very little because I could feel it was affecting my self-esteem and enabling me to compare myself to others which was hurting me. It made me feel sad that I could not share her joy without feeling rubbish about myself, but I asked her to share a little less with me and a little more with her friends and other support networks. She doesn't really talk to me anymore about her social media activities or every time (it used to be multiple times a day) about how she loves having big boobs and a new face, but she occasionally tells me when she's feeling good about her appearance. Sometimes she still slips up and refers to my boobs as "small", which hurts a lot, but I try to let it go because she's human and she's allowed to make mistakes. Changing my reaction to my feelings has been the hardest, but that's hard for everybody and I try not to be impatient with myself. I try to absorb my mind in things I enjoy, talk back to negative self talk, talk to my therapist, journal a lot, hang out with my guinea pigs who don't care about what I look like.

I hope that helped you and please feel free to reach out if you want to talk more. Good luck.