Written below are the notes of the D Blues scale which can be played in third position on a C harmonica.
Here is the D Blues scale played over two octaves. As with earlier scales, name the degrees mentally as you play, and try to memorize the scale. This will make things easier when it comes to creating licks from the scale.
Here is a lick derived from the third position Blues scale.
This one is a combination of a single note riff and a chord riff played in a call and response style. Try making up some of your own licks from the dorian scale and the Blues scale. The more you do this, the easier it will become.