It's very easy to find out nowadays, and you can be sure that if someone makes an edit and there's no credit the artist did not give them an ok to use it. An artist would advise or force the rule upon the person using it to add credit to, as said, avoid misunderstandings or have a bit of recognition for their work. When you take an image from an artist working for a company legal issues might get involved with the matter when you were to start selling these.
As for the possibility of the artist being the same person; unlikely when you look at the rest of this person's gallery and notice it's all edits of artwork that all vary in style without any recurring signature. I can safely assume these are not artworks they made themselves.
No, I'm pretty sure it's the picture. He just added the effects around the swords, darkened the color, and added the Krono thing. He didn't even acknowledge that it was a Sword Art Online picture. He just called it a Krono Logo.
I'm not talking about his skill. I was just saying that his intention wasn't to show the drawing, what he did instead is a graphic. I know, he should have leave credits, but I also think you shouldn't talk like that about someone's work, just saying…
of course, you and everyone is free to critique, but there are two kind of critiques: constructives and destructive but yeah, you are right, go and insult other people works, if that makes you happy… but you should think that you may hurt other people feelings And now this conversation is over for me