"Ever-changing" can go either way, as it's spelled with and without a hyphen, though it's usually spelled with a hyphen. As for "well-rounded", the word is spelled without a hyphen if the word follows the noun.

How do you know if a hyphen is needed?

Generally, you need the hyphen only if the two words are functioning together as an adjective before the noun they're describing. If the noun comes first, leave the hyphen out. This wall is load bearing. It's impossible to eat this cake because it is rock hard.

How do you use the word ever change?

Ever-changing sentence example. Here, too, the sand is raised into ever-changing hills by the force of the wind sweeping over it.