I discovered another process YouTube that shows an artist creating the image of a Succubus…
And in case the embedding doesn’t work:
The artist is Shelldragon, whom also has a Deviantart site you can find here.
He creates quite a lot of fantasy images, over the month of October he did a new monster everyday of which this work of a Succubus is a part of…
You can find the completed work here:
I haven’t received permission to post a copy of this work here, but it’s only a click away!