(NSFW?) If it's not NSFW, but looks NSFW, is it still NSFW?

Inspired by this (potentially NSFW) picture. The image is not of anything that would normally be considered NSFW, though it may appear so at first glance. Since one issue with NSFW material is what people looking over your shoulder might think, however, does the fact that the image might appear NSFW at first glance mean that it really is NSFW? Or does the fact that you could explain it away if someone tried to get you in trouble over it prove that the image is not actually NSFW?

Just in case you cannot figure it out, the picture is of a dinosaur’s head and neck.