| Right now I'm convinced that Minnu's skin seems to be drawn in large part from the Danae's skin. So no, not claiming that they just used the same sources.
That said, I know what derivative works are in copyright law ("A work consisting of editorial revisions, annotations, elaborations, or other modifications which, as a whole, represent an original work of authorship, is a “derivative work”.") and depending on the amount and degree of effort that went into the creation of Minnu's skins, I do think it entirely feasible that they might qualify as such a work.
Editing, adjusting, tweaking, and otherwise modifying it in an original way that requires some sort of skill and process seems not much different from revising, annotating, or elaborating on something. Usually, creators control the right of making or allowing derivative works. Renderosity's license nullifies those rights as part of the license, so long as the original material cannot be extracted from the derivative. |