For beauty, you can do a few things. First is the mixture, as you said, this is temporary, though. The next is the lab, where you can boost it permanently. And the last option is the Beauty Parlor facility where you can put tattoos on them. The nature tattoos increase beauty, but you only get a benefit from up to 3. I can't tell you if any of these count towards the quests, as I never actually do them. I generally just get my slaves to max Courage/Charm and set them to Public Entertainer. It's not a ridiculous amount of money, but it's enough that I can have a few set to that, 1 on cooking, and pretty much never need to worry about money. Since I don't use money too often, it builds up pretty well.
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Thank you. I will have to test if those methods count towards fulfilling such quests. I should note that I am not selling them for the money. By the time you have trained a slave to be loyal enough to sell like this they could make you a bunch of money from a job.
The reason I am selling them is for the mansion upgrade points. It doesn't matter how much money I have, I can't upgrade the mansion without upgrade points. which you only get from completing quests or selling a slave of over 90 obedience. I prefer the repeatable slave request mini quests since they give out more mansion points per slave
That's true. I just spam catch a few, scream at them until they like me, and then sell 'em. Easier than worrying about requirements for the missions. I don't generally want for points, plus a bit of story progression gives a pretty good number of points. And, finally, you can, at a cost to reputation, sell slaves to Sebastion after you've properly unlocked his services. The don't have to be high obedience, but there is a requirement, as I've had him say they were too rebellious. But they seem to give the same points and I can sometimes sell 'em without any training at all. And reputation's pretty easy to gain. Vigilante night anyone?