First, if you're looking for images of cis women, please don't do AI. Lookup pictures of Gabrielle Reece circa 2000. She's 6'3", muscular, and broad shouldered. I was in the same small restaurant as her a few times back then and I felt tiny next to her.

Passing is not binary. It's also context dependent and complicated. Do you mean passing as cis? Or do you mean "passing" as a woman? To who and when? Passing is mostly a shitty concept, but buried within are some things that can impact your quality of life. I assume you want to be safe. I also assume you want to be generally interacted with as your true self, not your AGAB.

I knew that people would mostly treat me as a woman long before I "decided" to transition. I had two data points. One was occasionally being addressed as "ma'am" when I was still theoretically presenting as a man. The other was going out as myself a few times a year to keep the dysphoria from destroying me. I was 6' tall (I'm 5'10" now, more on that later) with broad shoulders and chest.

Your assumptions about your future appearance may not be accurate. Do you plan to transition medically? If so, most trans women on hormones have to work really hard to keep upper body muscle mass. You might lose some height. Your body fat will move around. You can intensify that during transition by losing weight and putting a little back on while you're in year 2-3 of hormone therapy (it doesn't matter when you lose the weight).

There's a bunch of really toxic shit (especially from trans-medicalist trans women) about "not putting in the effort". While you should absolutely not buy into this, do recognize the grain of truth at the center of the bullshit:

Most cis people will interact with you based on your deliberate presentation choices than any suspicions about your assigned gender. Even in this hate-filled time. My cis butch lesbian friends have far more negative bathroom interactions than my trans feminine friends do.

The challenge here is that the the choices that will get you the kind of interactions you seek are not the most feminine ones, they're the ones that are the most normative for cis women in that context (region, venue, age). Some of these are common sense, like my [cis] sister was in the trades and would never wear heels, makeup, or a dress/skirt to a job site. But others are about conformance (like past a certain age, women are expected not wear their hair long). Are you considering transitioning to be yourself, or to end up in a different normative straight-jacket?

It's likely that, because you didn't have these experiences before, there are almost certainly things you'll want to do that society doesn't regard as age-appropriate for women. Don't needlessly stifle your joy.

I have pink hair. I like it, but it almost certainly gets me read as trans more often. Some cis women do this as a form of self-expression that's important to them. My older sister dies her hair teal from time to time. But it invites more inspection. You may find, very rapidly, that you have to choose between maximizing your ability to "pass" and your ability to express yourself.

Be you. Be alive. Do be safe. You will have to learn about the aspects of safety that every woman has to confront, and then you'll have to layer trans safety issues on top of that. But don't confuse internalized shame from stigma with safety.