Very disappointed in this lesson as written. I see no reason for the editing in Photoshop (or Blender) at this point. So I didn't bother to take the time. It adds nothing to the concepts being addressed, and merely adds a lot of time.
With the tutorials, I think the students will remain engaged, and I'd rather have them poke around some of the other culturally situated sites provided than with photoshop or similar.
I know of Blender, but have not used it - to throw that into a learning mix is more frustrating than helpful.