Wow, usually I'm not a fan of Hello Kitty but I would totally wear these! Everything is so clear and precise, It's obvious you put a lot of work into it.
i would say its much the same. If you can get a white to use as a base then pencil on your picture and color. Without the white you will probably find the colors bleed. If you have any more questions once you start just post on my profile, I'm happy to help if needed.