Am I doing it wrong?

Taylor • 20. Had my first baby girl on October 17. Macie Lane 🎀💕
So I saw this picture and got a little worried. My 3 month old has been a champ at breast feeding since day 1. Never had any issues, my nipples have never been sore or chapped but she does not put that much boob in her mouth. She only sucks on my nipple and that's it. I don't think I'm doing it wrong because she is eating plenty and at a healthy weight so, am I doing it wrong?