Make sure to UN-Wrap these meshes…then I would add the lash in paint mode or gimp etc…make sure to reverse and make an alpha mask…(Black background w/ white lashes)…when adding the texture between the Diffuse add a Mix Shader node …Diffuse on the bottom and Transparent node on top…use the Alpha Mask you made and plug-in to the Factor…Like this…
I understand you are making a different type of character, but to fit your character make the alpha image more stylized…a little thicker and perhaps arrow-shaped.