Well if that fly doesn't catch a fish I'll eat my hat
That is lookin' real good Miss Trillium !! I really like the colours ... the yellow hackle does two things up front.
1. Gives a great contrast to the rest of the fly.
2. Adds brightness to the fly. I call this "POP Factor"
. It gives an attention point to the fly to get interest in it ... sort of makes the fish do a double take.
That wing looks like it will just dance in the current and sway back and forth on the swing !! Movement is very important when designing a fly, it shows the "LIFE Factor"
. Most steelhead don't eat twigs, twigs don't move and pulse when floating down a river. This fly is no twig, it's going to have a lot of movement.
The way you tied that fly gives it a fantastic profile !! Very sleek, yet "shrimpy"
Your fly gives the illusion of a shrimp or even a baitfish swimming by. Two really good river foods or even threats to steelhead. However the fish interprets it, it will result in a grab !!
I will also say that looks to be a good size fly for fishing
There you have it !! You ticked all 5 boxes for fly design Miss Trillium, you know what your doin' for sure
And another thing, you dressed that fly perfectly without adding too much materials. Keeping things with just the right amount of materials makes everything flow nicely, both in and out of the water. Good job !!
Hope you get out and try that fly soon