Keep flies AWAY from outdoor parties! Use lavender oil on a sponge put it inside a can with a lid 24hrs prior the party. Open can enjoy your food w/out flies flying all over your food. You could make a few and spread them along your food display.
If you really want to master the art tying flies, and make your flies look “just like the ones in the fly shop,” then try applying these simple tips for consistent proportions. The trout might not appreciate it, but you will.