We have placed a few of these locks around the world. Metaphorically speaking, love is forever guarded by the lock. The key is thrown in the water, preferrably when both partners hold the key or hands. It signifies unconditional love.
Here is one of ours, a couple of years later and still going strong.
This is the first time I am trying highlights with a white gel pen, and I am becoming more aware of the highlights on the object, by not painting but leaving sections white. It is not very visibe yet, but playing with the brush pen gives me new insides how squeezing while applying the dark color will allow me to play with light and shadows.