Iris in pencil and markers

 

Here is a card I made recently, using markers enhanced with some colored pencil.  I like to do the deep dark colors with markers, and generally use Prismacolor.  Layering colored pencil, chalk pencil, or oil pastel on top adds dimensionality.  If you really need something to be white, however, make sure you reserve that space in the beginning!  I sketched out my lighter areas in pencil then erased once the yellow was in.