Rev. Joseph Opare, the founder of TVC (The Victorious Church in UK gave a very simple and balanced explaination on tattoos and piercing in the biblical point of view. Our body is the temple of the Holy Spirit and we have to honour what God has created. Even to keep our body healthy by eating right and exercising, we are taking care of what God has entrusted to each of us.
"Do you not know that your body is a temple of the Holy Spirit, who is in you, whom you have received from God? You are not your own; you were bought at a price. Therefore honor God with your body," (1 Cor. 6:19-20).
We are a steward to manage our physical body? That sounds weird but it's true nonetheless. God does not want us to be careless with our being, just as Jesus illustrate about our Father's watchful care: "you are of more value than many sparrows" (Matt. 10:31). If God is concerned about the tiny sparrow, how much greater must His concern be for man, who is immeasurably greater in value than the sparrow!
Knowing how much God loves us, the least we can do is to try make Him happy. Trying does not mean effortless nor it is being in a 'que sera sera' attitude but doing a conscious effort in pleasing the One who gave His all so that we might enter into eternity with Him.