Board Thread:Questions and Answers/@comment-35588834-20180514230704/@comment-30700719-20180515002504

I'd say that recolours mean that you've taken the time (or paid the money) to have someone's monster girl be recoloured. In my view, that's basically saying,

"Yeah, this waifu is so good that I wanna give her a new colour scheme!"

In fact, I've got one in particular that I would like recoloured.

But to answer your question fully, ask the author (or illustrator) before recolouring their work.