It depends on the species of fish...trout need appearance and presentation for the most part i.e. "match the hatch" because they are keying on specific food source that they see a lot ...anadromous fish, for the most part don't eat after they enter the river so presentation becomes most important and appearance less so...there's and old saying amongst steelhead/salmon fishers "they'll eat your car key if you present it right!"
All that said, your pattern is perfect for several different hatches that trout feed on like caddis, March brown, even a small baitfish...it can be dead drifted, swung, or stripped (don't tell anyone I told you to strip it

)...stick with patterns like this and you won't go far wrong!
The flies you've posted here have been great, keep it up!