Irises are in bloom

We have a clump of magnificent irises in our back garden and they are in full bloom.

These irises are pale purple. It is difficult to render the transparency of the petals and the light and shadow of their curled edges.

My set-up: sketchbook, Pilot Kuru Toga mechanical pencil, Sennelier watercolour travel box, brush with a water reservoir and... a cup of coffee