This is the beginning.  I want to illustrate my process for anyone who may be interested.  It is good for me to keep a record as I paint because it helps me teach, so here goes.  I picked three petunias out of a pot that contained dozens and I painted them with no lines on the paper.  I spent time trying to get good shapes with good placement on the 15" x 11" sheet of watercolor paper.  I used blue to push the light flowers forward.