The best I could find is a paper that found 36% of La Liga players have visible tattoos. I guess this doesn't confirm it one way or the other, since we don't know how many have hidden tattoos, but I wouldn't be confident in saying that it's a majority. https://www.sciencedirect.com/science/article/abs/pii/S0151963820302490
The full name of his first club is Sporting Club de Portugal not Lisbon. It's a very common mistake but you will get into trouble using the term here in Lisbon as Sporting Club of Lisbon were one of the two teams merged to form rivals Benfica. Here they are referred to simply as Sporting or Sporting CP
https://www.jetpunk.com/user-quizzes/160326/the-100-players-cristiano-ronaldo-has-played-most-with