New noob with GIMP.. Good, Bad?

[AlisonJones]

Before/After ... Had fun with this one. I just selected where the river would drop, used the rotate selection ( which I played with a little) and added the fish


   

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[Ofnuts]

The transition is too sharp next to the board.

I would go with a rotation and a  layer mask with the edge done with a soft brush in the mask.

   

Also, the fishes in the back are probably a bit big.

But pretty good for a start.