It's an alien pizza delivery guy. Note the use of sacred geometry used to place the pepperoni pieces.
Nice artwork on someone's part. I hope the farmer got paid enough.
Thankfully, I think this was created at the hands of humans. Unlike the dot matrix pattern of a human face found near the radio telescope in Chilbolton, this image uses line graphics, which is MUCH easier to create with known methods of "hoaxing" crop circles. Whoever did it WAS quite talented though. From what I've read of the image you posted Momaw, it too was also located near Chilboton...
Here's a series of pictures of the earlier human face formation for comparison..
