If those are your pictures, generally I'd say you have a 'nice' smile' (meaning the ones where lips are open). Its not perfect, but its warm and engaging. Don't avoid opening your mouth, your smile is 'above average'. Share the joy.
Well your smile isn't your whole face, y'know. Sure, it's a part of your complexion, and sure people prefer non-gummy smiles but remember that, like art, it's the whole picture that really stands out, not the individual components.