wikimedia and wpclipart.
It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
This image was acquired from
Keywords from Image Description:
Smiley green alien oh.svg smiley of green alien did it myself LadyofHats LadyofHats Other versions green alien
Page 2017 Free-images.com. All images are Public Domain