Hi, kinda newbie in here, so... I don't know much about SimPE and Bodyshop limits, so that is why I'm asking if it's possible.
I just understood, that I didn't really like how my already existing sim looks in game, and their "Improved clone" in Bodyshop - looks a bit better.
So I was wondering, if I can just switch their appearience to one what is in Bodyshop, by using SimPE?

You can change their face and eye + hair + skin genetics (the ones sims trnsfer to kids) with SimPE through SimSurgery.
For any other things like makeup/clothes, you can change it ingame.

A few tutorials:
http://www.insimenator.org/index.php?topic=84275.0 (skin/face/eyes)
https://sleepytabby.tumblr.com/post...lly-change-your (face)
https://sleepytabby.tumblr.com/post...ically-change-a (face)
https://modthesims.info/t/34086 (skin, post #6)
https://dreadpirate.tumblr.com/post...-sims-eye-color (eyes)

For hair I think it's similar to eye color - you pick a dominant color as the one they show with, and a recessive (same or different) as the one their kids can get. Sims directly from CAS usually have their current eye and hair color set double (although maybe not if you've rolled the pacifier and played with genetics), while if you've mixed hairs/skin/eyes in the game, one will be set as dominant and the other as recessive - in this context, dominant is the one that shows on the sim, while recessive is the one they can transfer to kids (this is different from the colors that are dominant/recessive ingame, like blond VS black hair, or dark blue VS green eyes, or non-modified custom VS default EAxis).