Wow, I need to find out about these figures.
You did a good job with the paint. I would add more gray hair ('salt and pepper'), by 1810 he was getting in his late forties...
Laurent Gouvion, marquis de Saint-Cyr, better known as Gouvion-Saint-Cyr, colonel-général des cuirassiers, marechal in 1812.
Cheers,
Patrick