Start thread at mid-shank and run a base to the bend.
Tie in a short golden-pheasant-crest or hackle-fiber tail, no more than a shank-third long.
Add a small red throat tuft at the tail to suggest the brookie's belly, then wind a slim body of tinsel or floss forward to the head.
Build the wing in stacked layers to mimic a brook trout's coloring: white bucktail first, then orange, then a green over-wing, and finally a thin topping of dark olive or peacock. Keep each clump sparse and the same length, reaching the tail.
Add short grizzly hackle-tip cheeks flat against each side if desired.
Form a neat tapered head, whip finish, and coat the head with cement or lacquer.