Is there any evidence that showing pictures of women actually makes a difference with this?
Even if you have, that's problematic on your part. Just because people look differently doesn't mean they won't be welcoming towards you, that's tribalism at it's finest and needs to stop.
The ones that do feel intimidated/uneasy about it need to work on their own perception of other people and not the other way around. You don't change the mindset of a group because there isn't any, it only exists on paper in your gender studies textbooks. Humans are individuals and everyone has their own mindset regardless of genitalia, skin color, age etc. Thinking otherwise is both disrespectful and racist/sexist/agist.