If still there are any hard edges just hide the using a soft round brush by painting inside the mask.
Add a new Curves adjustment layer at the very top in the layers palette. Adjust the mid tone values slightly.
And finally sharpen up the image. But we can’t apply sharpness filter to all layers at once. We will use the Apply Image command to achieve this. First create a new layer above all layers in the layers palette. Go to Image > Apply Image. Make sure the “Merged” option is selected in the dialog box. Press OK. This creates merged copy of the composition in our new layer.
Now we can apply unsharp mask filter to this layer. Go to Filter > Sharpen > Unsharp Mask. Enter the value and press OK. And there is the final image.
Preview of Final Results