You said you drew two blue skeletons, well darling you'd have to be a master artist to get them symmetrically perfect. Looks to me like you copied the image, then flipped it. So you can draw THAT well, then draw something else that well, it would be proof enough.
And never mind all that...how do YOU explain that exact image you "drew" being on Google Image's first page under "Dancing Skeleton?" Perhaps you meant copied or traced? If so it would have been preferable to admit that than to claim you drew it out of nothing. Plagiarism is the worst thing an artist can do