Been doing finishes of one kind or the other for the last 25+ years, so if you ever have a question, feel free:D
Built a few stringed instruments myself, they however are of the electric variety. They finish out with lacquer, and automotive paints mostly.
But I do play with oils, shellacs, varnishes, and pretty much all other varieties of finishes for furniture repair and such. Refinished or repaired about everything on the planet but an airplane:D
One quick note. To get that nice little fade in around the edge, try a product called “Transtint”. It’s water soluble, but also mixes with about every vehicle under the sun. I’ve used it in water, shellac, varnish, lacquer, and epoxy. You could do a light wash, then layer another layer of varnish, then another layer of color, and so on. It would darken the color without actually blocking the view of the wood.
Here’s a link to the product.
Also, remember a little of this stuff goes a LONG LONG way. Best used in moderation:D
Transtint Dyes and Stains: $14.35 Each
Another thought would be to use shellac to darken around the outside, then layer your varnish over it.
Shellac comes in a ton of color grades, just add alcohol.
These guys have “ye olde world” supplies. Everything from hide glue to genuine earth pigments. Here’s the shellac color varietals:
Sinopia Pigments and Materials - Shellac in Flakes
As for having a nice glow underneath, I guess it would depend on what the final finish would be. I’ve seen some absolutely gorgeous finishes that started with wax rubbed into the grain, then shellacked.
After the shellac, you can swap out to whatever final finish you choose. Shellac is a great isolator.
Hit me up anytime bro!
Gorgeous job!