They definitely don't seem too scary here! :D A friendly gathering of fuzzy critters for this familiar occasion! The one hook poking up at the bottom of the image feels like the only perceptible menace. Nice play with expressions and sensuality, the bear glare adds a sense of comedy too.
As for ratings, with no direct nudity (just revealing clothing) a T rating is usually enough. M should be a safe bet for partial nudity or artistic nudity (full portraits, etc), For A, pretty much anything goes!
-cd-