Facepalm given ironically.
Although, if we're referencing the shorter ginger haired sister, her artstyle is a little more 'cartoonish' than any of the other models. I like it though.
I have a save from the earliest builds, and can confirm that I have slightly different / higher stats in it than from a new playthrough (i.e. I have two saves, both played until the end of content, the character points spread is slightly different). Most notably, you used to be able to get love / lust points (+2 / +3) with the secondary succubus character which is no longer possible.
You need to pay attention in the newer build as well: some scenes give differing amounts of +love depending on what order / how you do them (from memory, mostly related to the throat fucking / asphyxiation scenes). A pink heart bubble appearing on the character *seems* to point to the maximal point path, although sometimes it appears to not have much effect (e.g. in the shared bath blow-job scene you can get a heart only if you choose one option for one of the women, any other choice doesn't give one).
I suspect this heart mechanic will be fleshed out / coded in later builds, atm it doesn't appear to do anything.