I thought I'd highlight my process for making minis.
First, I find suitable images from public domain sources. For the normal and giant animals and human types (bandits, etc.) this isn't so hard. Monsters sometimes take a bit of creativity.
While Medusa is a popular figure in Greek mythology, I couldn't find any decent images that would work as is for a game figure. Maybe if I'd looked deeper into Google Image Search or on one of the various PD image depository sites, I could have found something. But what I found was good enough to cobble it together myself.
First, I found this image of Medusa's head:
I trimmed away the background using GIMP's lasso tool. Then I colorized the image.
Next, I needed a body. Looking through my stock, I found this lovely medieval queen. Nice, elegant robes, and the body pose was also dynamic enough.
Using layers, I added the medusa head to the queen's body (deleting the original head so it wouldn't show through). Of course, I had to adjust the head size to fit the body. I left it a little bit big intentionally so that her ugly face will stand out. Next, I recolored the hands to match the tone of the face.
Finally, I combine these two onto a blank outline to be fitted into my next paper minis offering.