wel.. mdali lng nmn basta mtyaga klng. start with choosing a high resolution pict, then try to posterize it then konting adjustment lng mkkita mo na un mga tracing ng image, using pen tool you can start tracing. sa Illustrator mas madali kz it has "Auto trace". Sa photoshop ikaw mismo ggwa ng mga tracing so dapat ma-tyaga k tlga, coz to tel u the truth it's really a very annoying at first but fun and very rewarding when you finish your vector. If i have time forward k sau ibang tutorials on how to vector pra my reference ka. give me nlng ur email. thanks.