You found a wonderful subject in great light and a good composition, but the enlargement reveals imperfections in the stacking. PS doesn’t stand up to Zerene or Helicon Focus. Possibly some of the fault is with the number of frames… 7 at f/2.8 will have too many gaps. I would shoot 30 or more for that needed DOF. Very difficult before in-camera focus bracketing. Alternative is to use more like f/14 for a 50mm macro and hand-focusing. But PS still won’t do the job.
For this image: The whites look pretty good. Have you tried to lighten the dark shadow on the bottom leaf? What would you think about a slight crop on the right?
@David_Kingham, I wish an enlargement would let me scroll horizontally – am I missing something?