1)
Can one see that Sha'ul is proper for kingship by looking at him?
1.
Radak: Yes! A tall man of nice appearance is proper for kingship; people will fear him more.
2)
Why did Hashem pick the king, and not let Yisrael themselves decide?
1.
Malbim (17, citing Mahari): (a) Lest there be arguments, and everyone say 'I will reign!" (b) The king's heart must be clean from pride and coveting and every bad Midah. Only He who knows hidden thoughts, knows what is in the heart. (c) If the nation picks him, he will be submissive to them and favor those who chose him, but not if Hashem picks him.
3)
What was the Brachah "Yechi ha'Melech"?
1.
Radak citing Targum Yonasan: The king should succeed.
