So I was using Better Heads for a while...before I came across Westley's Master Head Pack.

Holllyyyy cow. These are amazing.

Now, is there any good texture mods to replace NPC heads, so they look this good? XD

Try http://download.fliggerty.com/download-127-874 - I am always surprised again how many people do not know it yet. It has been out almost a year now, but I guess it didn't have much publicity.

Also, if you like to have more variety in NPC heads, I have just today posted some suggestions in this thread: http://www.gamesas.com/topic/1505444-reccomendations-for-an-npc-head-replacer/

Well I guess I'm one of those people, haha. I'll check those out, thanks.