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My partner asked me what the differences were between a beginner violin and an advanced violin. We happened to be at my parents house where I have all the violins my brother and I graduated into and out of, so I rounded a couple of them up and laid them side-by-side and prepared to do some in-depth technical 'splainin.
But when I opened my mouth all that came out was, "the most important thing is to graduate from a violin with plain round black pegs to a violin with decorative brown or tan pegs with a scalloped shape, nobbies at the ends, and a bit of lathe work on the spindles...and some black trim on the tail-piece..that's real classy and stuff."
But it is about the easiest to understand answer I have ever heard to that question.
"This young wine may have a lot of tannins now, but in 5 or 10 years it is going to be spectacular, despite the fact that right now it tastes like crude oil. You know this is how it is supposed to taste at this stage of development." ~ Itzhak Perlman