As I have been able to fly around Canada and the US, I have seen pilots with full sleeves, ink on their forearms, knecks, legs, etc. and they have been great people to work with and fly with as well. When it comes to hiring, as FH1100 mentioned there are a lot of older CP's who do look down upon it, with that being said, I'd rather have a few tattoos than earrings or piercings when it comes to jobs. It also depends on the type of flying you are looking to do, whether you want to be doing VIP or working in the bush. End of the day, I have met executives who have much more ink than pilots and they run companies we fly for.
It is also how you present yourself when you go to shake hands.