We often see bows and archer heroes (and heroines) being depicted in various fantasy series, wielding some “legendary bows” with bizarre and pointy shapes which looks like unattended antlers, that realistically may not work, or very hard to tell how did such bows crafted in a more realistic settings.
In a Medieval European setting, many common design features may not be that usual on a realistic medieval longbow but more of a modern design choice, such as a well carved handle, separated bow limbs, wraped or coated nocks on both tips of the limbs, inserting magic stones into the limbs.etc, and I'm not an expert on medieval bows so I can't deduce such “modern” designs are possible for medieval bows and don't cumber their performances. This is same to more eastern style of recurved bows.
I'm asking here that, in a Medieval European fantasy setting (Actually more like Eastern Europe to allow both Longbow/Recurved bow as choice), with a little amount of magic involved, If an archer hero was given a “legendary bow” from either the Emperor of his country, or being gifted some “magic bow” by some certain not-Artemis deity, how can such bow being designed, that having a decorated and “heroic” looks to distinguish it from normal longbows/Recurved bows, but at the same time such look doesn't give away its historical basis of the settings or looking too bizarre?
How would such bow being crafted and/or enchanted that make it superior over bows of the same kind (and of same draw weight)? How would material that is available in such medieval setting change the shape and performance of the bow? For example in LOTR lore the elven bow strings are made of elven hair, would it realistically make a difference over ordinary materials like leathers and tendos?
What about carving limbs and inserting small pieces of jewels for enchantments? Would such decorations negatively affect the bow performance and making such design cumbersome?