What is the proposed use of these bowls? Going to hold objects, be decorative, be used for salads, cereal, etc. You would need some finish or else fingerprints show up over time. Danish oil looks nice but doesn't build up so no shine. Wiping varnish like Waterlox give a good protective finish and get a nice shine. Lacquer would probably be quickest. If they are going to be gifts, shiny things are more impressive.
Roy G