Enhance and Improve

22/03/17 Enhance and Improve

A quality (never a person) that is enhanced is expanded or raised.
The word in general has positive connotations.
A dash of salt to enhance the flavor.
But not always so in law:
“an enhanced sentence”; “the enhanced-injury doctrine”

If it is a person who is better than before, use improve.
We go to college to improve ourselves.