in gimp or other paint prg, copy and mirror the riìght part:
the load the default g8f base map for face and copy as new layer the first image
with lazo select the part you want apply, and try to balance the colors with the original color map.
Then with the eraser tools at 50% i clear some part of the top layer
after merge the 2 layers, and with the clone tools smoothing all
then save the color map.