Nice painting Sandor, you are really getting better.
When I'm painting the burgundy banner I normally paint the whole banner blue with lights and shadows. Then I paint the separat fields using the Light and shadow pattern from the blue.
I don't know how you fix your figures for painting. Normally I glue them on top of a wodden board. That works well with normal 30mm figures on foot or horseback. When I'm painting a banner I would do so with the figure itself. When it comes to the banner I cut off the figure from the board and place it on a piece of cardboard with a cutting for the foot plate of the figure. That makes the painting a lot more comfortable for me. See picture below.

An interesting fact about this coat of arms is number of the lillies in the two Valois fields. Normally I would expact the there is a certain number of lillies. But when I checked some original scoures the number differs. Starting with one big lillie in the middle or three rows with three in each up to much more as you have shown it here.
Christoph