I used colored pencils, watercolors, markers, ink, acrylic paint, regular pencil, computer graphics, oil pastels, regular pastels, crayons, and more.
Here are just a few:
On my website I put step by step directions to how to draw the sunflower sketch, followed by all the colored versions, and then step by step for how to paint them in acrylic paint. For the last bit there is a small step by step for the colored pencil drawing there as well. Please take a look at it all here: