Anyone know what this is?

Green 666 by isotope rays is NOT forgivable; it leads to permanent hell. 666 is given with World Passport with no name on it (grey plastic card). Police 666 people on highways. Food stores and prisoners/insane asylum folks (released by the antichrist) 666 people too. Reject vaccines. Don't go into UFO to be healed by demons. Hide with Orthodox Christians to escape 666; leave all electronics behind so that antichrist's minions can't track you; burn documents as documents are from Satan.

Reverse painted glass (black) backed by tinted crumpled tin foil. Sometimes called a tinsel painting.  Black ink was often the medium for the background, or for a silhouette.  These were popularly made at home by crafty folk from patterns printed in ladies magazines in the early 20th century, although the art form reached its heyday in the late 1800s. This piece is probably from the 1920s or 30s.

Girls in sunbonnets were frequently used in home art (quilting, painting, embroidery, etc.) and this piece has nothing to do with Holly Hobby or the 1960s. If it refers to any popular character (which it doesn't), it would be closer to Sunbonnet Sue, a popular early 1900s motif still in use today.

There are many samples to view on google images:

https://www.google.com/search?q=foil+reverse+glass...

looks like a woman in one of those huge dress things. like that yellow thing jane wore in tarzan 

It's from the very late 60s or 1970s..  The motif of a girl in a huge poke bonnet in profile was crazy popular at the time.  It started with an artist who painted under the name "Holly Hobby" and very quickly all the pictures of such girls started to be called Holly Hobbies too.  Your picture is someone latching onto the bandwagon, but weirdly making the motif higher-end looking than originally intentioned.