It requires experience, so start practicing. The Bowstring Knot is an ancient knot that is used as an eye for bowstrings. The knot is simple and strong. The bowstring knot is appreciated because it is small, strong, secure, and easy to tie. It's neat because it does not have loose ends.
Modern archers prefer fixed spliced loops.
If you need a good looking and strong loop this is a good candidate. The Loose end must be at least two to three rope diameters long. But if you make the loose end inflexible with for instance glue, resch or by melting and you can hide it almost completely inside the two round turns. It jams badly, but that s what it is made for. An excellent easy to tie loop for applications needing a loop in another place than the rope-end, but somewhere in the middle.