Found out today that this is called Nevada Rose. Have been working with acrylic inks, non permanent pen and watercolour pencils to study the subject further. Here are my efforts. I like working with acrylic ink and drawing with the pipette, mostly because I haven't got any other suitable implement apart from a brush. But I like the variety of thicknesses of marks you get with it. Tried some water droplets as one of the photos I was working from had some on the flowers and stalks. Now I have traced the design from my freehand tonal drawing on to watercolour paper and am looking forward to having a go.