Denise Ramsay is a botanical artist originally from New Zealand, who now divides her time between Hong Kong and a cottage in the southwest region of France.
Ramsay paints keenly observed and intricately realized watercolors of flowers and other plants, sometimes at a fairly large scale, in watercolor.
Her paintings are bold and dynamic, apparently without compromising botanical accuracy. In one of her projects, she painted a poppy from bud (images above, third down) to full flower (top, with detail) to eventual faded bloom. There is an article on Bored Panda that follows the sequence.
In addition to the gallery of images on her website, you can find a selection of limited edition Giclee prints.
There is a video on YouTube of Ramsay being interviewed by Katherine Tyrrell.