First of all, I need to say I NEVER trace photos or other people's works. That's too much.
Second: all the cases is not intended to pass for original work. It's strange to think that if you find something on the internet you can steal it, pass it as your own and nobody ever find original one.
I'm still learning, and sometimes when I like character, overall style, composition etc I want to know why I liked it. So maybe there is where the problem starts - I start to copy (or imitate) it to understand what's so good in it. In the end it's more like a redraw, or a 'tribute'.
My thoughts was that draw tributes means to express my love to the artist and to learn from him. Yes, mistake was in not giving a proper credit, and now I understand.
My biggest mistake was to don't have an ability to understand that it doesn't clear about originality of the pieces, about tributing, to think that is something obvious.
And I'm really sorry for that. I