Seeing all the lovely still life paintings posted by various artists here, sometimes makes me itch to try it as well. I've never painted flowers or any other type of still life, so will be quite outside my comfort zone. I fear I'll be the laughing stock of the forum.
Just remember you are not painting flowers you are building a design. No one cares if they look like the real thing as long as they trigger the viewers mind. These are little demon faces smiling at you and yet you, me, and others see roses. Weird stuff. Enjoy.