This skin can also be written to the path:
Units\Other\BloodElfLieutenant\BloodElfLieutenant.blp
though the shield wrap and weapon may become a bit warped.
Shield and coloration for this is based on the advanced unholy armor icon (which sadly has more pixels than were left to work with for the shield on this skin). The Helmet is based off of the revenant icon, so if you feel like using said icon for this unit that would make perfect sense.
Keywords:
Footman, Captain, Dark, Champion, Unholy, Death, Dusk, Oblivion, Knight, Revenant, Rune, Blade, Skulls, 67chrome