I like your use of double stops and the way you carry through with the pace of the piece. On bowing, I’d suggest a little harder pressure. The viola requires more pressure than the violin. You show glimmers of interesting technique at various spots. This is a good start. Actually, I have not done as much improvisation on the viola or violin as I have on the piano — that’s a goal of mine. I totally got stuck in just the reading of classical music for the viola, although I branched out a little on the violin into other genres.