Might I suggest something? If you are going to do this coloring by hand on paper instead of on computer (as in Photoshop etc), then I would go to a good art supply store and hand pick some colored pencils in the colors you are considering. Magic markers are not going to look like you want them to- the colors will be way too dark and/or saturated. Pencils come in ALL colors and hues, and will stay true to their color as you apply them- also much neater results. They can cost more than cheap magic marker sets...but if you narrow your choices down to maybe a dozen or so colors before you go get them, then it will be feasable. A good art supply store will have a BIG stand with perhaps a couple hundred colors of pencils.