Comb and wattles aside, she has quite a feminine face. She doesn't have huge bulging brow ridges and her forehead slopes back unlike a rooster's forehead. She's a pretty girl.
My Orpies usually lay a large to XL size egg. Do you have any Leghorns in your flock? All of my Leghorns lay 90g + eggs, a few are on the cusp of laying 100+! That's Colossal or King sized as they say Down Under! :thumbsup
Look at the saddle feathers, the Cape, the hackle feathers. If that doesn't convince you he's a boy, look at his face. I'm not talking about combs and wattles either, but the underlying face structure. Just like you can look a horse in the face and tell a boy from a girl (though not all...