I like the Tiefling appearance and animations so far but...
It irritates me that Tieflings have the same color on horns and skins I think this is quite odd.
Maybe you can change this at least in the future if it is too much work until the planned release (which should be in March if I see it right)
And if Tieflings use the fiddle the currently equipped weapon dont disappear, this is a quite common problem that makes also meditation look stupid on monks who use weapons other than unarmed.
And this is also a problem every other bard has who use lutes, they play the instrument and you have still both weapon in your hand or maybe even a Tower shield...
Another point is that it is certainly very nice that you have now a new instrument, but it would be of course even better if you could play the lute on your Tiefling too if you wish (and fiddles on other races)
Bards could have an additional equipment slot for instruments and the instrument you use decides the animation.
stats on the instruments could be performed skill or improvements for some kind of songs.
This would add a LOT to the bard class.
I just noticed that you have a fiddle you equip to the quiver slot, this is at least something but what happens if you want to use a quiver?
We need a separate instrument slot at least for bards