I would have to say that God looks at the heart of a person, I mean, if we dressed or wore jewelry, piercings, tatoos that were purposely against God, but I think things in the bible that are mentioned, like jewelry, are meant to teach us not to focus on "looking" good on the outside, but being submissive to God on the inside. I don't think God cares if we have a tatoo, or a hundred, as long as we don't think that is something that makes us more of a christian. I may see these verses differently than others so I hope no one gets offended by me using these. The first one I see God telling me that He doesn't look at our outsides, and He doesn't want me to either, but it is the way of "natural man/woman". The second verse is telling me that my nature is to be important when I have say, a great job and accumulate a lot materially, but God only cares for us, not our stuff. Also, everyone knows, I'm sure, that God doesn't want our stuff to ever be more important to us then Him. But He doesn't mind us having things. The third is about that, not having something of His creation that we worship more than Him. There is a lot more to Exodus 20:1-15 that I think, but I won't include it because this is getting long-winded, lol;)
The fourth verse tells me, again, don't fuss with the outside thinking it will make me closer to God or more of a Christian, but it doesn't tell me I can't wear jewelry or fix my hair (or have a tatoo). It's just about God looking at my heart again.
There are a couple of verses I think of:
“The LORD does not look at the things man looks at. Man looks at the outward appearance, but the LORD looks at the heart.” (1 Samuel 16:7)
“He said to them, “You are the ones who justify yourselves in the eyes of men, but God knows your hearts. What is highly valued among men is detestable in God’s sight.” (Luke 16:15)
Exodus 20:1-15 ESV
And God spoke all these words, saying, “I am the Lord your God, who brought you out of the land of Egypt, out of the house of slavery. “You shall have no other gods before me. “You shall not make for yourself a carved image, or any likeness of anything that is in heaven above, or that is in the earth beneath, or that is in the water under the earth. You shall not bow down to them or serve them, for I the Lord your God am a jealous God, visiting the iniquity of the fathers on the children to the third and the fourth generation of those who hate me,
1 Peter 3:3 ESV
Do not let your adorning be external—the braiding of hair and the putting on of gold jewelry, or the clothing you wear—