IMO it's kind of pointless to "score' a foal. They change so much.
They might change a lot to you but an experienced eye can and will see the potential, or not.
I bred a foal from my mare, brother, that was the ugliest foal I have ever seen.
His shoulders were forward with his neck sort of set back into them, making it look short and his head way to big, his back was hunched and his joints were enormous. I wanted to pick him up by his back legs and give him a shake to unfold him!
I knew he would straighten out and that he had plenty of bone. A show judge saw him at three weeks when he was less folded but still downright ugly, especially compared to the other four foals we had. I was pleased when they remarked, from just watching them in the field, that he would be a lovely looking horse when he was four! To forget about him until then!
They were right, he remained to look as if he was from four different horses glued together until he was three, when he grew into himself. He always had a big straight movement which was eye catching. I had shown him at small local shows for the experience and although he might be placed he was always down the line, at three he was winning these shows and I took him to bigger shows where he did very well, often beating the 'big boys'
A friend of mine bought him, she rode him on and he continued to grow to get to big for her. He won dressage and in the show ring. He did exceedingly well. Unfortunately just as they were getting a name for themselves he had a freak accident and broke a leg.
Particularly in Germany they inspect the foals, and continue to inspect them through each year until they are four or five, inspectors know what is wanted and how a foal can change and assess accordingly.