One of my trainers (from when I was new) has a huge tattoo of the Virgin Mary that covers her entire forearm.
Sr GSTL and ETL-SL have some words tattooed on their upper back, if their shirts come down a bit in the back you can see it.
ETL-LOG has a tattoo on the inside of his wrist. In fact, several TMs have wrist tattoos at my store.
A SLTL has several tattoos on her arm, visible if she wears short sleeves.
One Starbucks TM has alternating hair colors: blue, pink, blond, etc. Another has tattoos and (small) gauges.
Grooming standards are pretty relaxed too, several male TMs and a TL have good sized beards. I would imagine it's more strict if you work in a food prep area, but on the floor it's completely fine.
We used to have a BRTM that had sleeves and a couple (small) tattoos on his face. Probably why he worked BR, lol.
Unless you have something really out there, I wouldn't worry too much.