Hi,
You would need to ask someone who is currently serving as a pilot. (I am not)
I don't know how it works over there but I have had to email airlines pictures of my tattoos to see if they would accept them.
Most airlines have replied stating that if they are able to be covered in uniform such as a long sleeved shirt then it is acceptable as long as they are not offensive.
I hope this helps,
Probationer.