I will readily admit to not having done anything of the magnitude
you are talking about but I can answer a couple of your questions.
Typically you don’t need to enamel the inside of such an object.
Because it provides it’s own tension by being enclosed and not flat
you don’t have the warping problem you do with a flat piece. Same as
with a bowl.
As far as colors go. Many colors are hard to work with on Silver,
please test them in the combinations you are planning to use first.
Many of them turn yellow…some colors can not take repeated firings.
Especially those in the red range. This will vary based on the
specific color and “brand” of enamel used. The leaded european types
tend to hold up a little better.
Last, I am assuming you soldered with IT solder. Even with high temp
solders there can be a tendancy for the solder to flow up through the
enamel or show beneath transparents. This tends to increase with
What a job to pick for a beginner! Good luck!