The first horse, the one pawing the gate - first, don't tie to a gate, please. Tie to a solid post, please. I know it's only a few seconds for photos, but you don't want your horse running around with a gate tied to it. Yes, I know the horse never would pull back from the gate, and he's very well mannered; so is everyone else's horse. Yet it happens. Tie to a post, please.
That horse looks too thin. All the ribs can be seen and the topline is not well covered with muscle and fat; it also needs more muscle from consistent, correct riding.
The conformation of the horse is fine, but he looks in rough condition - needs muscle, fat, feet done, etc.
"How can I make her neck look better, I hate it".
Thoroughbred horses look their best when they are at a condition score of about 5, and are getting plenty of correct, consistent riding, month in and out, to develop muscles on their hind quarters, back and topline.
They can look 'fat' in the belly, but it's just a haybelly, and the muscles on the neck, back and hind quarter are not built up.
What builds up muscle? Correct riding.
The mare is also somewhat thin and needs some fat to improve the coat condition.