It may surprise you to know that the tailpiece can make quite a difference to the sound -- it is not the material it is made of but the weight which matters. The metal tailpieces by Wittner, with built-in adjusters, are designed to be the 'correct' weight.
Some luthiers consider a boxwood one to be a bit on the light side. I have boxwood (Hill pattern) on my violin and am quite happy with it but one of these days am going to change it to ebony.
My previous violin came with an ebony one but quite small, and it looked a bit tatty. Purely for cosmetic reasons I changed it for a boxwood Hill and the difference and improvement in sound was amazing.
There is a good book called
The violin explained which goes into this (and lots of other interesting detail).
Let us know how you get on.