I really enjoy painting irises...you might have been able
to tell from previous postings. They are a very versatile
flower and I often use them when I teach my workshops...
I usually start the first day with a simple assignment, compose
an entire painting using just one flower that you turn and twist
in your hand so you record various "poses" of the single bloom.
It's not as easy as it might sound...actually quite the opposite,
because it forces you to really think about composition, relationships
between shape and size and overall design. Try it sometime!