Cathy,
I really like your spoon. Nice balance to the design.
In my experience I would stay away from oil based finishes if you want the wood to stay as light as possible. Try a water based poly. They don't seem to darken the wood as much as oil based. I really like General Finishes High Performance, their Polyacrylic does well too.
If you plan to actually use the spoon try mineral oil. Let us know what you end up using.
Rick Doby