''you look like...'' vs ''you looks like...'' vs ''you look(s)...'' what's the difference?
you look(s) like a child acting like this.
you look(s) very handsome.
you still look(s) good for your age.

Question

Answer

The base definition of 'look' in all of these contexts are similar, but not entirely the same.
1."You look like a child acting like this"= this is used when someone acts childishly, and is thus compared to a child using like    as a simile This means the person isn't a child, but is compared to one due to his behavior
2".You look very handsome"= describing the person's appearance and used literally. It means that the person saying it to someone else genuinely thinks that (except if he says it sarcastically)
 3. "You still look good for your age"= once again, simply describing outer appearance

Answer

We NEVER say "you looks", ever.