I actually used Copic markers for this. But sometimes I use colored pencils for other drawings and for that I use Prismacolor. But really, cheaper brands like Crayola can work too. It's more about the technique than the material. It's just I'm a little picky about the specific colors I need especially for my original characters. I like Crayola, but it's sometimes impossible for me to get the colors I want no matter how much I try mixing different colors together. Prismacolor offers a range of colors that suits my needs better and that's why I chose them over Crayola.