Terrific headquarter, with a lot of depth. Low set hock. Both good/typical for a western or working ranch horse.
Very prominent wither, with a curious dip behind the wither. Seems to be a chronic lack of muscling? Very difficult to fit a saddle to correctly. Shortish shoulder, neck tied on high on the shoulder, slight ewe or underdeveloped neck. All this together means he is built to travel somewhat hollow and inverted; will be difficult to get him to round up.
Cute head, more refined than a lot of apps.
Nothing that would keep him from being a useful pleasure horse or competing locally.
Hard to critique the yearling, other than the obvious butt high, which is typical for a horse that age.