Transformation photos are used to market fat loss programs / online coaching services. It's the closest thing to looking into a shop window to see what the shop has to offer. They'll be amazing. But don't be mislead. Don't be fooled into thinking a 12 week fat loss program can give you the muscle mass that is visible in a lot of the 'after' photos. Any muscle mass you see will be muscle that individual had PRIOR to the fat loss program. You can't build muscle in a time frame that short.
Fat loss programs & fat loss coaching is SUCH a great investment if it helps you achieve what it's designed to achieve... fat loss.
If your goal is to build muscle and then reveal the muscle so you are stronger, with a more defined/toned physique - you need to be thinking longer term. Think minimum 1 year. 12 weeks is great for a fat loss phase. But the real change in strength, performance, and how your body looks, takes time!