Tracing isn't considered fanart also, and altering ones original designs without permission is considered disrespectful, credit or not, consent is needed.
And like Alice said, that's because you gave credit to a FEW, doesn't make you better, because what about the MANY others?
And stealing random drawings, whether from a popular creator, or not, is NOT OK. The only time its mildly ecceptable, is if its a screenshot, a render of a show, or official merch (i guess?) from that official show itself.