Ten year-old Tiffany Obasohan and 11-year-old, Onyamaechi Christian Yobo from Nigeria have been announced overall winners in the drawing and storyboard categories respectively in the first Cartoon Network Imagination Studios competition, while Nyasha Mazarura, an 11-year-old from South Africa was the overall winner in the movie category. The brand new initiative from Cartoon Network (DStv…