I've tried to give several options to fit different budgets and crafting situations. If you have specific questions, feel free to message me through the classroom!

For eyeball:
Clear glass "gems,"  Link to Dollar Tree: https://www.dollartree.com/clear-glass-accent-gems-14oz-bags/105572
                                  Link to Michael's: https://www.michaels.com/clear-mosaic-glass-gems-by-artminds/10286301.html
Acrylic paint OR Sharpie markers in black and different colors. This is for painting the pupil and colors of the iris. 
                        Suggested: https://www.michaels.com/12-color-acrylic-paints-by-artists-loft-necessities/10124967.html

For space around the eye/eyelids/scales, there are choices of types of clay or modeling compound:
Oven baked clay:
Sculpey 2 oz bricks (my personal choice) come in a variety of colors. You can find selections here: https://www.michaels.com/search?q=sculpey
Fimo is similar to Sculpey, and Michael's also has their own Craft Smart brand. Prices vary. More than one color can be fun to mix and blend.

Air Dry Clay:
Model Magic is lightweight, Crayola air dry clay, and DAS clay are all great choices. They vary in price and there is usually more in a package than the Sculpey, Fimo or Craft Smart clay, but they do not come in the wide variety of colors. In this case, I recommend buying white clay and painting it after it dries. Here is a link to a page that shows all of them: https://www.michaels.com/search?q=air%20dry%20clay

Other materials:
Paperclip(s) to create a "bail" for hanging the pendant on a chain, cord or string. Chains, cords and strings can be found at Michaels as well.
paintbrushes (tiny details will be painted, so small, pointed brushes are really needed)
bowl of water
paper towels
things around the house that can be used to impress textures: straws, toothpicks, ball-point pens, screen, anything you might have at home that will make the texture of the clay look dragon-like! 
aluminum foil (this is what we can use to create the clay pendant part and transfer it directly to the oven for oven-bake clay).
Cookie sheet if clay is to be baked