Early days of a Lannister Warhorse

Progress on my Game of Thrones Lannister Knight project is still at the very early stages with work primarily concentrated on preparing the canvas for my first serious attempt at painting a complicated freehand design on miniature. With the shield-like emblem measuring just 12 mm by 15 mm, I was first tempted to just use a decal for the heraldry. However, I couldn't find any suitable ones hence