Should be lots of material out there. I just did that Medusa on a whim, playing with monochrome, but there were lots of other figures just in her story alone. People, places, events. Sounds like fun! With plenty of time, too.
In a nutshell, I sketched in pencil, outlined with a Micron pen, then erased the pencil (well, most of it). Brushed in the ink: yellow, red (actually "Process Magenta"), green, orange then blue. Finally added the grey, then black paint in the helm. For the heraldry fans (I think this is right - it's been a long time): Per chevron gules and or, in chief two roses of the second and in base a rose of the first. Above the shield is placed an helm with a Mantling of gules doubled or, and on a Wreath of the Liveries is set for Crest a phoenix azure in flames proper.
Okay, for the mythology challenge, I decided to do a version of Daphne, so here she is:
The usual oil pastels: Neopastel, Mungyo Gallery Soft, and some Senneliers, on Arches Oil Paper 12x16".
I didn't really have a plan for this one, just made a bare sketch. So it took awhile to figure out how to get her into that tree.
The story of Daphne in Greek mythology begins with young Cupid, little god of love and of the arrows. Cupid was playing with his bow and arrows, and was mocked by the god Apollo, who happened upon him, and sneered. This did not go over well with Cupid, who drew two special arrows from his small quivver. He shot one, gold-tipped, straight at Apollo, pierced his heart and made him susceptible to huge love. He shot the next one, lead-tipped, at young Daphne, daughter of the river god Peneus, designed to make her reject suitors. Apollo pursues her madly and she pleads with her father to help her be rid of him. So he transforms her into a tree. (Why not turn Apollo into a tree, you ask? Fair question. I personally file this story under: "The Things We Gotta Put Up With.")
It's also actually a laurel tree in the story, which is why Apollo wears his crown of laurel leaves in her honor. Well, I wanted a massive oak tree. I could see those big burls coming out of the roots and thought it would be fun to hang them on her hip and leg. Artistic license! It was fun to do.