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You can scale any image you use but obviously the results are a lot better looking if you make a big image smaller than if you enlarge a little one. A "sharpen" capability is nice to have if you adjust a perspective or shrink a large image down. Details often get blurry and adding a little sharpness back compensates for this. Also, it's easier to edit a straight-on image to become a perspective view than it is to try to straighten out an angled view. Sometimes you don't have a choice, but when choosing images a nicely lit straight-on view without sharp contrasts is preferred.
I usually start with the field, add a background city or sky scene that has a good perspective match with the field and then build the stands. I do the details - like stadium lights, images for ads and the scoreboards - last. I tend to leave all my layers unmerged until I make my final rendering and then I will revert back to unmerged layers so I can change something down the road if I choose. At times, you will need to merge some layers and edit them together, such as when applying drop shadows or altering brightness.
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