Pete, you've achieved 3 nice pieces, I like the 2nd bud vase and use of timbers, Ash & Cherry .. with !!!. it has come out well, as with the top vase, looks to be a nice box, like mentioned with time you'll refine the details.
Finishes are endless, differs in any combination or one's own formula, vary from the use, to the durability of the finish, what has been mentioned, you've been well advised so far. Again over time you'll expand on the finishes with what you like and which work best for you.
Well done so far and to that wonderful Grandson, between both you it's a good team.
David