A good many horses are tied in below the knee, I don't think it's as much of an issue if the horse is not a jumper or galloper.
There is a kind of 'classic conformation' that many of our American specialty and versatility breeds don't really strictly follow, in general type, nor in a lot of the details. That 'classic conformation' ideal was designed for real fox hunters and for galloping type race horses. It's come down to the show hunter ring (with some changes) but had less influence on the sport horse market.
The horse has a very, very nice gentle eye with a lot of depth. Seems to be standing very nicely for the young person in the photo.
I think the horse is what you could call a 'family type TW'. The show horses seem to me, to be taller and this one is a little longer in the back, a little shorter in the leg than them...more a family type horse.
The faded color for summer doesn't bother me, though it's a big deal in some types of horse show classes and even would get marked down, I'm told.
As long as the horse is comfortable in the summer, that's all I care about. The type of showing I did, fading in the coat is ignored, and the horses are often clipped so wind up being a whole rainbow of intriguing colors - chestnuts look pink and bays and blacks can be mousy dunny colors, and no one cares.
The trimmed mane doesn't bother me either, again, I think it's about comfort, if it's more comfortable that way, that's good.
I think if the bugs are bad, an untrimmed mane and tail can help to shake off the flies and mosquitoes. One has to balance that against the difficulty of keeping a mane combed out, it getting snagged on things, and if it makes the animal hotter in the summer. When it gets very long and gets tangled in the reins or whips one in the face it's pretty annoying, especially on a hot day. Usually a good tail is plenty for bugs, and the mane is just a matter of preference.
It's hard to 'critique' the conformation of Tennessee Walkers as they have a different kind of hind leg than a sport horse or other type of horse that gets a more traditional kind of evaluation. The kind of conformation that is desired for Tennessee Walkers is different.
They generally have more angulation in the hocks, and a sport riding person, especially one into hunters, might say they were sickle hocked or have too much angulation, as those guys especially like a straighter hind leg. But the angulation is usually more in TW, and is supposed to help them gait.
Your horse has that type of angulation in the hocks, just what most people seem to want for Walkers. For a sport person, they might not understand the gait, and would say it's too much.
Many people in a variety of different riding sports, like to see a tiny little teacup chin and nose on all breeds and a dished foreface, preferably one that resembles an extreme Arabian horse profile, but that isn't really typical for a TW. The head is more masculine and the nose tends to have a little 'Roman' profile. This one is more typical TW in the head as well.`
The MOST important thing for a family, pleasure horse is its temperament, and how reliable, consistent and trustworthy it is. That's something you just can't quite 100% capture in a picture.