It is interesting that Galadriel is one of the few people in Tolkien's universe who bridge between the Silmarillion and the LoTR, playing a major role in both.
Going back and looking again, it does seem that, while her face looks young (or "ageless"), her hand show much more indication of time.
(20 years? Hmmm... perhaps you are a little older than I had imagined. This would explain some of the maturity in your art, would it not?
)
So, do we need to challenge one other -- me to challenge you to re-read the LoTR, and you to challenge me to re-read the Silmarillion?
Blessings!