What would you do and why in this scenario?

A 37 year old relative has taken on a few new hobbies: writing poetry and learning how to play the piano. So far, he is passionate about both.

There are now around five “books” of his poetry in electronic format posted for sale on Amazon. There are a few videos he has made of his piano-playing skills and one of him reading his poetry, all posted on Facebook.

I applaud his pursuit of hobbies. The thing is, he isn’t any good. The piano skills may come in time; the poetry is a train wreck.

He’s a nice guy. I don’t want his feelings hurt. How might I encourage his efforts without telling him he desperately needs an editor? He hasn’t asked for help. Should I just keep my mouth shut?