STEP 2: Mirror this geometry across the X axis with Merge Points turned on. Select the eyebrow and eye socket surfaces that got merged accidentally with the surrounding mesh; Cut and Paste this geometry to regain its shape.
Tip: use the Polygon Statistics panel to select all geometry with the part name, "Separate Mesh".
STEP 3: If you see any gaps in the center seam, select the offending pairs of points, Set their Value to 0m on the X axis, and try Merging them again. Failing that, Weld them together.
STEP 4: It should look like Figure 1. Save this object as head10.lwo.