I'm a bit worried that so many people are mentioning Suzy's hair - of course being blonde will get you looked at, but the idea that a few cm's adjustment here or there will make you passable is a bit, well.... People usually make up their minds on the whole package, at a distance? Like I & others said, you can't tell from a still photo..
And there are plenty of women of a similar age to Suzy out there, wearing their hair bright blonde, even some wearing wigs - why should you have to dress dowdily, if you don't feel it?
There's a difference, isn't there, between 'passing' and being 'passable'?
and there's a balance too, between 'blending' and not expressing yourself as you want the world to see you?
IMHO voice is only a few percent - get the other things right and people will discount what they hear, when they get up close, unless it's totally discordant and grates..All that said, some things are a bit more important than others when trying to pass. Hair, face and voice are probably 80-90% of the equation, from what I've seen. The other stuff is important, but if your hair and face look very female and your voice sounds female, most people will overlook a lot of other things.