Unfortunately the Devs don’t usually create the Female versions of NPC Races unless they are female-only (like Harpies) or very important races (such as Vrykul or Naga).
Fortunately a few of them have been depicted in Official Art:
Female Water Elemental https://wow.gamepedia.com/File:Warcraft_I_-_WaterElemental.jpg
Source: WC1 Manual
(Obs: Female Fire and Earth Elementals can be found in-game. Female Air Elementals can’t be found either on Art or in-game)
I would say Kobold, Ogre, Gnoll, Jinyu, Constellar and Wretched are exactly as should be expected.
Water Elemental, Satyr and Djinn look particularly good.
Broken Draenei is the only one that looks bad. But I’d say that’s more of a Shadow Wing problem than a Female Broken design problem. If you pay attention to the image, you’ll see that the Male Broken Draenei around the Female one also look terrible lol
Honestly I prefer the arrakoa approach. There’s something profoundly silly about “take the character model we have and slap boobs on it”, like they did for the new quillboars.