 His only successful area in his educational pursuits was sketching and the arts.It would take him until around the age of 11 or 12 to go from sketching to painting in colors, however, which was when his parents discovered that Uderzo was color blind.From then on, Uderzo would use labels on his colors, but as he mostly stuck with black-and-white sketching, it would not make a huge impact on his artistic career either way.