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The pictures help but I don't rely on them, because they don't protect the earliest embryos and fertilized eggs. What I do is simply look at all of the criteria that they toss out for drawing a line between two years of age (when fully human self-aware thought turns on as the brain finishes being wired) and fertilization and point out that two years of age and fertilization are the only logical places where one can place the beginning of personhood. Yes, I get a few die-hard pro-choice atheists who will happily (like Peter Singer or Michael Tooley) defend infanticide, too, but most people are not willing to sanction infanticide as the logical extension of their abortion views and start to see the logic in drawing the line at the other end. It's a bit more complicated than that but that's the gist of it.