It's very well diagrammed, I find it very easy to follow. Thanks! Wonderful!
But! The chains have a different stitch count!
Plus: I found a beautiful site by an australian tatter, another master tatter I think, who tatted the doily a dozen years ago: tattingingprogress.blogspot.it
(Sorry for the .it but I'm not sure that it's ok everywhere! Ah! Uncertainty...) Then go to her page "doilies". She writes that used 5-5 for chains...
Then I'm no more so confident on picots' size, neither. Look at the red circled part: I would have done shorter picots to give more stability. I'm not yet convinced that picots could work all of the same size. I'm not sure , but...
There's also a little ruffle in this fourth round!
Oops, no no, it is the third!