Why is there a “stroke” in the middle of my mesh?
(Its mirrored)
There must be some vertex points next to the edge line which is the middle, that are further on -Y axis than the middle line from which the whole thing is mirrored.
They should be sculpted with F smooth or F flatter to make the line less visible.
While I’m not sure if F smooth and F flatter in Blender version which You are using is called in the same names.
It could also be matter of - if somehow the whole of the middle edge contains a face.
If You try to turn the mirror off, and if the middle edge loop from which the half gets mirrored doesn’t contain face - then just try to set the first vertex points which are on the right from the middle edge “from pictures perspective” behind the -Y value of the one on the left or “middle” vert of the middle edge loop (if its a loop)
As that’s what it seem to me.
Or just copy Y value of e.g “bellybutton” vert value by pressing ctrl+c once You mouse over the “bellybutton” vert value. Then select one next to it. And hit ctrl+v to match it on Y to the one in the middle.
P.s. To me everything I see there is wrong because it’s not Blender 2.79b, asit is the only one I use.
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Thanks… there was a face in the middle… 
Yeah, that’s how mesh behaves unfortunately.
Just as You wont be able to enjoy smooth shading of faces.
If in some places where multiple vertex point values get set to 0
while many verts are selected in order to get them all in same place.
You’re welcome.