Not a bad piece. The form isn't exactly Rondo form. Just to give you some insight on that form: the form is a sectional form comprised of sections with a repeated section or ritornello. The overall structure is usually ABACABA... You can variate it a ton of weights. This seems to me to be more ternary form than anything. The pizzicatos are nice but at one point they didn't seem to really be functional but were more ornamental. A look at a score would really help in the review of this. Renderings aren't really a good arena to review a work as many of them add interpretation to them now - which can hamper a thorough study/examination/review.