It's important that your entire tie in area be no longer than 1/4 inch. I recommend "fine" mono thread and applications of superglue after you finish the white body, and again when you finish the colored topping. Nymo or other saltwater grade tying thread can quickly get away from you and give you an uneven or too fat head. white Bucktail, flashabou, and polar bear or white fish hair layered in that order. four to six bunches tied on top of each other until you like the body shape. Don't let the material roll around the sides of your tie in. It should be about a 1/4 inch high at the tie in point and just about as wide as the tube at this stage. Then on each side cheek with bucktail, then fan out 20 or so strands of flashabou cut uneven about the length of the cheek, then another layer of bucktail, then silver flashabou or crystal flash. Now make another 11 :-) For this color combo then a sparse layer 4 to 6 strands chartreuse crystal flash, sparse bunch chartreuse bucktail, sparse layer blue crystal flash, sparse bunch Bright green bucktail, sparse layer peacock crystal flash. Keep the krystal flash sparse or it will look like a neon sign in the water. "Holiday green sparkle" scribbles fabric paint for head. For flies over 5 inches feel free to add matching color fish hair to the colored bucktail. Unlike a straight bucktail seahabit this is about a 15 minute tie for me.
Oh yeah, that head is 3 heavy coats of Loon Hardhead. Takes about an hour between coats to cure hard, at least 40 minutes on the wheel. One coat hardhead or epoxy, apply Tshirt paint and eyes, Let the T-shirt paint dry over night. Two more coats hardhead or epoxy.