Oh my, aren't the Polygala flowers just amazingly beautiful? This is a textbook example of this fact.
The noise is easily abated by some post processing so just a minor annoyance.
By the way, focus stacking is a sword that cuts two ways. While you can squeeze more (and often very impressive) detail out of a subject, the process itself tends to kill the inherent photographic value of the scene at the same time. Some times just combining the sharp(er) detail of say two frames might suffice to tip the balance in a positive manner without destroying the image itself.
