Build these faces with Create Face.
Insert these edges with Cut.
This gap is sealed by creating polygons as shown. Try to obtain the same mesh layout you may have to use the edge visible/invisibe button
Image of right-hand side shows the hole filled with Create Face.
After adjustment of the vertexes.
Apply a material with enough shininess to see the defects on subdivided surface.Correct and adjust with the cage low poly.
Aim to have a maximum number of faces as quads and not tris as this guarantees best possible smoothing with Meshsmooth.
Onto the Nose
Insert a vertex using Divide into the base of the nose.
Fill the hole with Create Face (as in picture, middle).
Insert edges with Cut (picture, right-hand side).
How the profile looks after adjustment of the vertexes compared to the template (mode See Through).
Insert these edges and adjust for with dimensions.
Insert these edges.
Adjust the faces of the nose as with dimensions as on the images.
The base of the shape of the nose is now finished.