I'm not against this for something like the PPGs, but every time someone tries to do this it ends up like the OP, sex objects. Not inherently bad, mind you, but I'd like PPG as "innocent" as they were perceived, adult or not. I'm against the notion that "sexy = perv", I for one think it's cute as long as it's not the classic PPG (you know, because they are 5) and is why I prefer more PPGZ because it can be more forgivable/appropriate.
TL;DR: I rather just have the original style of the girls for fan art, less of >>84666494
, although I still like it because Cups is my favorite girl. However the Z Girls would work better for "lewd" because it's cuter, at least to me.