Well, I finished with the inking this morning. I'd estimate that if I did this in one sitting it was probably about seven to ten hours. I purposefully stopped before I inked the little chain on the far-right purse. I knew I'd need to get it perfectly straight, so I might as well do it in Photoshop tonight. I'll also perfect a few things like the big ball in girl #3's hair, since I'll never ever get it round by hand. I'll also be policing other little things here and there, just to get it all ready for the last step.
I decided not to ink a costume on Girl #3, just because I'll be giving her a black bodysuit. so she'll essentially be wearing a coat of paint - so no linework necessary at this time.
I'll be posting the final image before retiring tonight, and I'll also be posting my formula for the separations I do before painting, which is really the main point of the tutorial in the first place. Thanks for your patience on this.