Proverbally Yours -Type Poster - Key and Lock Outline

I had a couple of idea running for the type poster. My first one was to create the shape of a lock and key out of type, but i'm not too sure if this would fit with the running theme, even though it is using a lock as imagery. From the previous simple designs i had created previously, i went on to make some more in better detail...

This was just playing around with a few ideas. The first one is following an outline of a KEY.The second two are variations of the KEY going into a PADLOCK. I like the concept behind this, but i'm not too sure how well this would fit into the other two designs. I feel that by keeping the type poster much more minimilast. it will help to flow better in the set of three. Also i thought it was quite fitting that as i had the proverb 'It's always better to be on the safe side' that i would take a safe bet with my type and keep it really simple. As the famous saying goes when it comes to design, less is more.