sieggi858:
An addition from an outsider:
Copying styles are a huge hassle...
There is a reason why mangaka-groups like CLAMP split up the work into smaller parts. One for the BG, one for males, one for females and so on. When there are different artists for the same subject they normally have tons of reference sheets.
Normally there is a limited number of artists doing the pre-work while the rest of the team does the finishing touch - with references. They even train & study the style they use and focus fulltime on that specific project.
What's more, Witch Trainers has a special style which is rather distinguishable, while other projects have a rather generic style. If it was anime style X it would be a lot easier...
Imitating a style from nothing is an art in itself.