If you are going to use other people's art, you should credit them. I recognize that the effects are likely your own photoshopping, but the girl cat is Elh from Solatorobo. So unless your the original Dev, you should put that in the description. As for the black furred individual, I don't know who that is, but its likely you dont either.
Its kinda not only law, but also polite to credit someone for their work. Otherwise its theft or plagiarism.
If you are going to use other people's art, you should credit them. I recognize that the effects are
