Here is an example of my photo editing I do occasionally, these images are scaled down 10x or more to fit this forum.
First is the original satellite image which normally comes in around 12000 pixels wide:
Due to new construction the terrain will change, so photo editing was needed, The beach was cleaned up and the shallows were cleaned by removing kelp and seaweed, I do not care for stuff one cannot see or stuff that will be hidden in shadows, but as you can see I did the bare necessities to get image to work, who has time to fiddle these days as projects of these scale only have about a week from start to end, gone are those days we would have a moth to complete them.
So here is the butchered image:
As you can see I spliced in a bit of Bali beach into the grand Cayman. Now I apply this material to my terrain, I find using the standard Google terrain within SU is normally good enough, if I need to make alterations I can select the area and using Artisan I can subdivide and sculpt as needed then reapply the projected terrain over the new mesh.