Heraldic rules to paint a pavise

by Kristian1969

Hello, are there rules to paint a pavise? Last quarter of the 15th century, flanders. I'm thinking of dividing the shild into four. On the left the cote of arms of the lord of Gruuthuse. On the right the cote of arms of the Duke of Burgundy. Beneath the St George's Cross, as a relation to the English crown. Below that the crowned B. who symbolized the relationship with the city of Bruges. Three golden balls as a personal touch, winner of the marksmen's party. I understand it's a specific question. A referral is, of course, also nice.

TywinDeVillena

Sorry /u/Kristian1969, but this is AskHistorians. Your question may be much better suited for /r/Heraldry