Layers with Birds at Sunset

This was originally for the low light theme but it was hard to get a nice landscape for the wonderful sky. This one had a funny shape tree in it on the left. So I cropped picture to a square but saved one of those little red clouds from the cropped bit in a different layer. I had to chop away quite a bit around the edge as the colour didn't match. I tried just using the opacity to blend it but it didn't work so I merged the two sky layers and used the plaster healing tool to blend in where I'd cut it. I just selected the birds and copied and pasted them into the picture. It didn't seem to work with the composition until I flipped the background sky horizontally then the birds fitted in better. I still have all the layers if you have any suggestions for moving the birds etc.