The stable diffusion image to image robbed me of 70 sats lol
I did prompt "smiling" and this image link: 
https://primal.b-cdn.net/media-cache?s=o&a=1&u=https%3A%2F%2Fnostr.build%2Fi%2Fnostr.build_921103a346a15dd528b2f2e56db0d30bac05dfd6604d7a2873d474b718621a58.png

maybe it just needs to validate the image before payment.