I googled it and found this : http://www.wikihow.com/Draw-a-Butterfly. Im sure there's lots more if you google too, then you can find something right for you. I didnt know what the butterfly project was until I saw your question, so it's good that youre raising awareness and helping yourself too.
what is it?
like drawing on your skin.. it's a good idea really.. I suck at butterflies though - mine would look something like this http://www.wpclipart.com/animals/bugs/butterfly/butterfly_basic_art/butterfly_clip_art_purple.png
I didn't do that one. I googled it sadly enough
It doesn't matter. As long as YOU know it's a butterfly it can look however you draw it..
well just use the picture I linked and practice following the lines and then try.