I liked the painting and must say that I also liked your reasons for painting this regiment. For the same reasons I coose to paint the 18th Hussars (Grandfathers Regiment) the Ox 6 Bucks Light Infantry (Fathers Regiment) and the Royal Berks (County of Birth).
I was surprised that you painted the bag on the bearskins as striped, since my fist thought would be that they were a solid pink with white piping. When I get a chance I will consult the relevant page on the Seven Years War web page.
Although more care is needed in this scale, I would like to see a Grenadier Drummer in reversed colours for your de Ligne regiment. So if you haven't done so yet, give it a try. Muscians in reversed colours always give a splash of colour to a regiment.