Analyze the melody and take note of any places where there are skips in the melody. If the skip is only a third, use a passing note to move between the notes. For instance, if two consecutive melody notes consist of an A and C, then the passing tone would be B-flat or B between the two pitches.
Play appoggiaturas when the melody jumps. To do this, simply choose a note above the original melody and add it to the already notated rhythm. If there is an eighth note, then you will turn the written note into a 16th note and place the appoggiatura right before the written melody note.
Perform a neighbor tone when the melody holds a particular pitch for one beat or more. To play a neighbor tone, simply move up to the note above the original pitch.
Execute a trill when you have a note longer than a half note in duration. Play a trill by rocking back and forth between two fingers while pulling the bow across the string.