SOOC
This is the first time I've ever attempted shaped bokeh. It's not nearly as good as most I've seen on this site, but not too bad for a first attempt...?
@naomi Your lens should tell you the lowest (numerical)aperture number...as far as conversion to size of the shape, I can't give you a hard number w/o some research but I would say start as small as possible and go up from there. My first attempt wasn't a success by any means, something I need to attempt again. You on the other hand did amazing for your first try, Great job!
Fab first attempt! Had the same problem initially! I actually really like your effetc, it looks like the butterfly is fluttering away into the distance :-)