Scarlet swallowtail butterfly (Papilio rumanzovia) from Butterfly World ...
If you're interested to use this photo as a reference or stock - you are welcome to it - as long as:
1 - You give proper credit with a link to this submission on DA
2 - You post your final work on DA (and let me know about it since it's pretty cool to see).
Also, if you are planning on using the photo in your blog or another personal site, you are welcome to it as well, as long as you give proper credit with a link to this page.