Crayon Art in Quilts

This was a question asked on flickr, though others might have it too. There is a note on this photo on flickr that reads crayon art right over the two tree drawings. So here is the explanation.
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Santo Pano Patchwork says:
Crayon Art ? How does it work ? Fabiana.

Sunshine said:
This can be done a few ways

1. Color on paper; lay paper on top of fabric and iron. Have paper towels between iron and paper so excess wax doesn't transfer to iron. (Image will be reversed; remember when writing words and things that have to face a certain way)
2. You can color straight to the fabric then iron to heat-set pigment; again have paper towels between work iron to absorb excess wax (best to use high-quality crayons for either way because you have more pigment and less wax).
   

Santo Pano Patchwork says:
Thanks for the tip, I've already tried and it has worked perfectly. I've got a good result, from my first time with this technic, I'll try to improve next time.
Thanks again for being so kind.
With my best wishes.
Fabiana