The rose is almost completely finished in black and white.
I am usually tempted to fiddle with it at this stage (the horrifying artist trait of not knowing when to stop) but I find that any work I do in fine tuning it now will be undone by adding color. Why? Color will take out the highlights and flatten the areas I've shaped. I will have to scratch them in again.
So as long as I have my strong darks and lights I will be fine to move on to the next step. I can't wait; color is going to really make this flower sparkle.