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Selecta soft round Brush Tool at a decent size (100px) an paint with black in the layer mask to hide the areas encircled below.
To get rid of the ugly black spot in the middle and to make the ground look right we will repeat the trick from step 2. Let's make a selection of some ground that looks good on the right side and make press Ctrl + C to make a copy of selected area (before you press Ctrl + C turn off the visibility of the white Background layer an make sure that you have selected the ball layer in the Layer palette). Create a new layer on top of all layers (Layer > New > Layer) and press Ctrl + V to paste it.
Now it is only a matter of placing this layer on the right side and using Free Transform and warp to make it fit. Add a layer mask to this layer (Layer > Layer Mask > Reveal All) and using a round soft black brush tool paint over the obvious edges. You should have something like the image below.
It starts to look good but there are still a few elements that need correction. First there are some elements that repeat themselves (like the guy in white or the red cordon). Create a new layer (Layer > New > Layer) and use the Clone Stamp tool to remove the indicated spots. There are some additional glitches where the lines in the ground unite but I think the ball it's looking pretty good as it is so I won't spend any more time correcting it.
Make sure that you are on the original ball layer and Ctrl-click on it to make a selection. Press Ctrl + Shift + C to Copy Merged (copy all visible pixels, not only the ones on the layer we currently are).
Open the image "Apples" and press Ctrl + V to paste it. Name this layer "Metal Apple". Make sure you save the image so in case your computer crashes your work will be safe.
Use Free Transform (Ctrl + T) and warp to fit the ball exactly over the middle apple. Don't worry about the protruding stem (the little stick that connects the apple to the tree).
To make it look more realistic we need some texture from the original apple. Turn off the visibility of the metal ball layer and using the Pen Tool make a selection of the middle apple.