This is the stuff I love seeing! Solid color use, coherent style that translates well to other units, presumably an entire army. Great use of the old skulls on the shields is the cherry on top! I'm repainting my TK as they were done when I was new at the army painting thing but I've done enough that I won't switch to this theme but I am tempted!
The figure himself looks to be a Tomb Guard, and the banner top looks like it's either from the Bone Dragon kit or one of the Giant skulls in the Citadel Skulls kit, but I'm not sure about the banner itself. The standard unit banner is one from the Orc Boyz kit as I recall.