Martinez was delighted with Baines' two-goal performance in victory at West Ham United.
"He has an incredible influence," Martinez told evertonfc.com. "When you see him play in that manner [against West Ham], he raises the level of everyone in the squad.
"They see him as an important figure - not just at the football club but in English football.
"At his age he is starting to influence a lot of people and when you see him perform in that way he is a huge asset for us.
"You look at his performance at West Ham and I have never seen a player take free-kicks like other players take penalty kicks."