I managed the fairy wings for my pattern and it is now posted in my Etsy store.
I wanted to share my first experiment, I decided against using it but you may find it informative anyway.

I used my first butterfly wing pattern to create mirror image wings that I then added a vein pattern to. I traced this onto tissue paper and used watercolor pencils to add color. After the paint settled a little bit, I added Mod Podge. I added several layers, letting it dry between. In spite of the tissue tearing a little bit with the first layer, it still looked pretty good but it was very fragile. More Mod Podge would have solved that, but with the tears, I though I should begin again with tracing paper.