While the lion's head in this picture probably represents Venice since it is the city of the lion, I prefer to let it represent Jesus Christ, the Lion of Judah -- our King and great Commander. I'm reminded by the pieces of armor of the verses in Ephesians 6 about putting on the armor of God. Why do we as Christians need armor in the first place?
Walking with God doesn't mean we're surrounded by a "bubble" of protection to keep away evil and temptation. You're still tempted and rough times still get to us. On the other hand, God offers protection not only with His presence, but in the form of these pieces of spiritual armor to help us in the spiritual battles we face every day. There's the belt of truth, the breastplate of righteousness, shield of faith, helmet of salvation, and sword of the Spirit - to name a few (see Eph. 6:10-20 for the whole story).
When we walk with God, He protects us. That's not to mean difficulties won't arise, but every sadness or hardship He allows in His followers' lives is meant to be for our growth and believe it or not -- for our eventual blessing. Praise God -- and pass the ammunition!