It is a good idea to check your back cast. Good back loops are the key to a successful presentation. A knowledgeable casting companion is worth their weight in gold. However, most of the time we are casting by ourselves. Watching your back cast is great but it is not a great habit to develop. I like to watch my shadow and snap some photos of it. A picture is worth a thousand words and certainly not “fake news”. Pinch your fly line on the rod and use your non casting hand to snap a photo right when you stop the rod on the back cast. It is a little tricky but if I can do it, so can you! – Jim Solomon
The Fly Zone 