If you want to tweak a sim, you will need some sort of slider hack so the features don't snap back.

I use Aikea_guinea's default skin, along with lots of non-default skins.

No reposting or making small tweaks and reposting. Other than that, do whatever. If you use them as models, just tell people where to download them if they ask. Or, better yet, just post a link.

I try to make sims that are reasonably realistic and true-to-life. If you don't like a certain sim, give me decent, workable criticism here on this blog. I hate sifting through MS3B posts to look at comments on my sims only to see pretentious 'critic' shit aimed at me that I obviously don't deserve D: