so i was unwrapping this head and for some reason even though i've got appropriate co-ordinates on the entire thing, half of it wont display any image i apply...
looks like you could have two materials applied. i see different surface qualities on the gray areas that look different in the checkered area
make sure you don't have a selection while applying a material
it also looks like a mesh that has a fucked unwrap
lets see that unwrap
at least a few N-gons in there too (just from that image I can see at least 2 or 4 5-sided polys.) that might be causing issues with the UV but you certainly want to clean that up before you unwrap it as that can cause any number of issues throughout the workflow.
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make sure you don't have a selection while applying a material
it also looks like a mesh that has a fucked unwrap
lets see that unwrap
good luck there