Let me start by saying do not google ‘male center line’. Your model looks like he’s falling back, or saying “who, me?”. From the side view, the head should sit directly over the body, not rocked back. His neck is too short as well (or maybe his shoulders are hunched). My advice is to take a photo of yourself in a bathing suit from the front, back, and side. If you have strange proportions, use a friend. Drop those images into your scene and make it match. Once you get the overall proportions worked out, you can dig into the details.
A good rule of thumb for the head is that the eyes go in the middle vertically, the bottom of the nose is in the middle of the line between the eyes and the chin. The mouth is in the middle between the bottom of the nose and the chin. Again, photo ref is critical. I included a shot I found on the internet and a side view of a model I built for an outfit project. My model isn’t perfect, but it maybe illustrates the point. Based on the photo I found, I think your head is a little too small and the eyes too high up.
Let me know if you have any questions.
