"Red Barn in Winter" DVD

Announcement:
I am in the final editing process in the production of my new watercolor instructional DVD. It's the latest in my series of watercolor videos. Here's a section of the painting taught step by step. (click image for larger view)

Step One in "Red Barn" DVD

I'm trying to decide if I should make it into a shorter, 20 minute lesson for $20 or use more material on technique, composition, closeups, etc. for the fuller version (60 min.) at $30.

What are your thoughts? Please let me know what you think.