After El Mundo‘s art department encouraged her to draw for the paper, she started illustrating for the op-ed page, exploring visual metaphors and capturing the essence of each opinion piece. Oshima eventually began experimenting with intricate black and white line comics that told a story sequentially. With comics, she was able to bring to life the interviews and reporting she was conducting. In 2013 she left Madrid for the Bay Area and now freelance illustrates for El Mundo. She also writes for Rolling Stone España and Spain’s Jot Down magazine. She spoke to Storybench about how she picked up a pencil and started illustrating the issues she was reporting on.