One thing I learned from making medieval armor and weapons, is that old European ideas on what is attractive when adding artwork to items is very different than our ideas of what looks pretty. You have to research how they decorated things back in the time period and not rely on our own sense of artistic embellishment. Example: The finest engraved suits of armor had bolts and nuts holding vamplates for jousting and on areas of the helmet. To them, these industrial elements showed off the craftsmanship and expense of the armor harness. To use, they stand out as ugly and inelegant.