Nice tie. The rib should be exactly four turns of each material. Very close to your pattern, snd a good inexpensive fly to practice with, is the Dallas. The hackles are black Dory hackle (I use black schlappen in the example). The head is dirty orange-pink dyed mohair or seals fur. I fish these. The loop is #20 Dacron backing, bound to the hook with black Danville’s 6/0 and super glued.
Mike