Ah, but you're using your macro, so surely you must take several as they are such perfect and numerous subjects for that lens!
I'm somewhat surprised at the clarity on the foliage in the background, I imagine they must be rather close to the tulip itself or at least of a similar distance from the tulip as the tulip is from you.
This would be a good subject for some focus stacking, so that you can get the center of the flower in focus.
I think this is a good result and you can get even closer with that lens and get some great detail on the flower.
Although the 100mm is very sharp, when you close in on a three-dimensional flower, I found it very difficult to achieve spot-on focus just at the places you want, while keeping the aperture low. I guess it's a question of balance - and patience :).