Step 2: Design
I did a google image search for poppies and did some thumbnail sketches of some photographs I saw. I decided on this image from http://poppieshealingnetwork.wordpress.com/ for my final design. I had to simplify some of the edges to make it workable in glass.
I then took the thumbnail I had made and blew it up to the actual size of the finished piece. Again, this size was determined by the amount of glass I had on hand to work with.
Graph paper makes this thumbnail-to-working-design process a breeze. Every square in the thumbnail became three squares in the final design. Easy!