I am trying out the app at https://waifulabs.com/ and the art style is kind of one-note. Most of the expressions are the same and the face shape skews towards loli.
I am more into "disgusted anime girl that looks at you like you're trash" type and I couldn't find a waifu (even with their refinement steps).
Really impressed that this is even possible though!
I've played with it a few times. It seems like they have you choose features in the space in the order of base -> palette -> art style (loosely) -> pose, but have locked some emotion controlling vector to be happy. Probably a reasonable step for their audience.
I think a large majority of anime art have happy expressions, so it might not have been anything that they had to do.
Edit: "disgusted anime girl that looks at you like you're trash" is the theme of a recent book that got adapted into anime, so it's a bit of a fad currently. I thought that was worth mentioning.
I am more into "disgusted anime girl that looks at you like you're trash" type and I couldn't find a waifu (even with their refinement steps).
Really impressed that this is even possible though!