Once in my workshop, I scour my graveyard of action figure body parts to find the correct head, body, limbs and accessories that match the design.
For Levity, I used a Superman (TM) head and Spider-man (TM) body.
I then chop off the correct parts, re-attach them to the correct body, and sculpt or sand the rest of the figure to my liking. For sculpting, I use Magic Sculp compound, and for sanding and shaping I use a Dremel tool.
After all the sanding and sculpting are finished, I attach any capes, bracelets, arm bands, or belts. Then it's time for the painting and detailing. I use craft acrylics, and seal the finished job with an acrylic clear coat spray.