In direct response to the OP's question, I'm not even sure what one could possibly use as a standard for cis-gendered or trans-gendered women. There's just way too much variation. I think it is perfectly fair for any member of the trans community to feel sad about their body, regardless of wether they pass or not since the two really have nothing to do with each other.
I understand that this thread is about appearance and how it relates to self-image, but keep in mind that self-image is so much more than just that. While there are plenty of measurable aspects that make up self-image like height, weight, etc. there are also those all those intangible aspects too. It's not only about what you look like, but how you truly see yourself, your personality, what kind of person you think you are, and how much you think of yourself. I realize that this is really the ideas of self-concept, but its important.
My opinion is that there isn't any one standard that we should judge ourselves by. What works for me probably doesn't work for everyone. While a yardstick may give us a direct way to compare ourself to others, there is so much that is lost reducing your image into that standard. What works for me as far as judging myself is really wether or not I am living to my morality and personal values, not my appearance. I won't pretend that I'm not comfortable with my appearance now, but I wasn't always and I actually adopted this mindset well before transitioning and I was incredibly upset about my appearance. It's your self image though, use whatever standard works for you, and by works I really mean something that at the end of the day you can use to bring yourself up, not take yourself down. You have to be ok with being you, especially if you want others to be ok with it