using reference does not always count as "plagiarism", and it's useful for learning how to draw. I'm sure more than a few of these ~OMG POOR RIPPED-OFF TALENTED ARTISTIC MASTERS~ like Taka Tony will use photographic reference from time to time.
Some artists do copy/trace other artists' work to get a start; but its when these amateur artists learn how to draw/paint and then continue to copy/trace that it should be considered poor taste and plagiarism. Someone also commented that Tony Taka might take real life pictures for reference in posing, honestly who doesn't?
its not a problem that they ripped stuff off as such. its a problem that they claim the main linework is by Sae(when it is by fism) and have that huge credit crap going lolol