This is a ranker from the 40e Régiment d'Infanterie "Grenadiers de France". The regiment was created at the end of the War of Austrian Succession when several units were disbanded. French Etat-Major decided to keep the grenadier companies (so to speak the best soldiers of each regiments), but to gather them into ONE single unit, then created the "Grenadiers de France". The regiment took the rank 40 and did admit only grenadiers. Their uniforms reffers to the King's blue color, as the most of the other line infantyr regiments did get the white/grey uniforms. The most of the Maison du Roi was dressed in blue with red facings too, but the Grenadiers de France wasn't a guard unit, even if they were more skilled than a lot of other regiments.
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Upper body close-up :
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