I think these pictures, and other roughs I posted earlier, give a good idea of my stamp design process.
I decided against using the full image of the swan children of Lir sheltering from the storm and went for the transformation scene instead. But I was able to adapt the first design for use as a decorative panel on the stamp sheet.
Amongst some old roughs I found the mock-up below where I was considering the tragic image of the old children of Lir from The Names upon the Harp.
It makes a nice companion piece to the scene of the four of them huddling together as swans.