For some reason, on the first section – which points downwards to the right - I did my stitching from the outside to *follow the outline*, rather than pointing inwards to the centre. (It should be visible on close-up)
This gave quite a different look to the rest of the split stitching, which I did pointing in towards the centre.
Looking at the original image
the stitching was either horizontal to the leaf (top section), or pointed inwards (right and bottom sections).
I haven’t looked this closely at many leaf images, but from what I have seen, I’d say that following the outline is an incorrect ‘look’.