The first healing process is to have a conviction that you are doing a wrong thing. Then, you will get rid of the pictures and try getting a hobby. This hobby will be good to help you keep your mind occupied during those idle times. When you are idle, this is when you are prone to engaging in stuff like looking at girl pictures in a bad way.
It's so important that you realize that you have a problem. And I want to let you know that I am personally proud of you that you are willing to ask for help. It takes a lot of courage to do so. There are a few steps to take in order to break an addiction.
1. Pray- ask God for His Holy Spirit to help you to fight temptation (Luke 11:13) 2. Ask someone for help 3. Replace negative thoughts with positive ones 4. Don't give up! (1 Cor 10:13)
There's also an article that helps a lot. Follow this link to receive the help you need: