I am just about 1 yr in to playing, so my advice would be very limited.  But, I have to say I thoroughly enjoyed listening,the "expression" and the different bowing techniques.  The pieces were very "listenable" to - I am (ashamedly) largely ignorant of classical pieces - and how these would "normally sound" - but I enjoyed them very much.  Yes I caught the subtle vibrato !

I'm WAY behind that level of playing, more of a "fiddle music" fan myself.  I leave it to others more capable than me to give you constructive feedback!   Thanks for the performance !