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I started with a clean-up at the leaves...
I have used layer mask, as I`m showing. But you can use eraser tool(I don`t like).
I have used a tablet Wacom Intuos 3 to make the clean-up

Here is the clean-up result

Now : IMAGE>CANVAS SIZE. I increased the size at the botton of the garden source...

I dragged the leaves to the garden image

(239 days ago)