Hibiscus focus stacked

Anyone who has taken a photo of a hibiscus has experienced the frustration of that super long stamen. Something is always out of focus in a single shot. This is a manually stacked composition of three shots. I could have used a fourth. Can you see where it was needed? It's not an entirely fair question, as you'd have to pixel peep to see it and this is only a 1000px shot.

Bottom left edge of the petal looks a bit soft.

I'm guessing where the petals bend backwards slightly at 8:00, 11:00, and 1:30. It looks pretty good at this magnification though.

Nice job. I've got quite the variety of hibiscus growing in my yard. I'll have to try doing some stacks.

Really good result from only three images.