Increase poly smoothness What is the best way to increase smoothness on this model?
Specially on that highlighted part which is too noticeable.
If you duplicated your mesh and mirrored it, you have two halves that are still unconnected.

The Subsurf modifier stops at the places where when you have unconnected vertices:



To fix this, enter edit mode, select all of your vertices (kbd>A,), press CtrlV and select remove doubles