I’ve been fishing soft hackles a lot lately. The sparse hackle you’ve tied seems to work best for me (one full turn of partridge is enough). I don’t put tails on either, but there are those who do so it’s not “wrong”, just “anther way”.
I’ve found woodcock, starling, pheasant (male and female), grouse, and hen feathers all work well for hackles (as well as partrige of course). Slim bodies, are best I think. Sometimes I’ll add a turn of peacock hurl in front of the hackle as a head, sometimes two turns behind as a thorax (or a small dubbed thorax). For a body, I’ll add a “mist of dubbing” on some, and for others it will just be a floss body, one turn of hackle, and a small head of the same colour as the body.
It’s hard to say which works best though. I’ve generally found size 14 is the best “all rounder”, though size 12 is good, and 16 and 18 have worked too.
I’ll also tie them on dry fly hooks, when the idea is to fish them just under the surface, on just in the surface film. Heavier wet fly hooks are useful to get them to sink a bit more. Basically, softhackles are a very versatile type of fly.
I don’t think I’ve ever not had at least some success with soft hackles. Not always the most effective fly on a given day, but usually can depend on catching a few on 'em. That goes for most species I fish for, and I fish for most species-- from trout to carp. I tie them small and sparse for both trout and panfish, big and heavier hackled (maybe two full turns of hackle, not enough to inhibit motion and up to size 6)for bass. The one you have pictured looks great. Pheasant tail and peacock herl make good bodies as well as the traditional floss in various colors.
It certainly looks buggy, which the fish will tell you, too. And it has that fish-love-it stuff called peacock herl.
To help this fly sink, I’ve been tying soft hackles with out tails and using various colors of ultra wire where you’re using quick descent. So if it’s a Partridge and Orange, it would be a Partridge and Orange Wire for me. We have good luck with orange, dark green, gold, red, black and chartreuse. Then for the thorax I like the quick descent too, but more often use ice dub in either a contrasting or coordinating color.
I caught a really nice brown on a Partridge and Green Wire on SD’s Rapid Creek a few years back.