a) I learned that you'll really need a lot of patience in doing a task to have a good output.

b) -probably they can be used as decorations. . .somewhere in the garden, maybe. . .
-they can be sold and be a source of a little income. . .

c) These dragonflies are made from 99% perspiration, neatly crafted with good quality [used] stockings, colorful and elegant to the eye. They are durable and held firm by high quality wire