Yeah, i tried it a while back and just did one image at a time. It turns out you have to add postive/negative prompts and add special values to each. The hands were by far the toughest and if you fix one part it fucks up the another part randomly. Also creating a femboy is damn near impossible since it defaults to a male or female based on the features you specify. If I remember correctly it should be free for a certain number of prompts, maybe you should try and post some if your feeling ambitious like I did.