I love your work so much, this one is no exception. But I do notice a few things that are incorrect with the violin. Sorry, I'm not being rude or anything, it's just that I've been classically trained in violin since I was 6 so I always notice this
Firstly he's not holding the bow right, the pinky finger goes on the last little brown bit that sticks out at the end, right on top; the next to fingers sit on the silver dot over the black bit; and the pointer finger rests almost on its side on the main top brown bit.
Also the bow is resting too far down on the strings of the violin. It should be between the bridge (the little wooden slat, which I think needs to be moved up a bit) and the neck (the black stem part). I think the actual size of the violin is a little big too, but if so it's not too obvious, and if it is you could always say it's a viola as they're bigger
So sorry about being so picky. I'm really not trying to be rude or offend you in any way. I just thought I could help