Sunflower, above, wondered whether this is "ligne claire". Not exactly, I think (saying this with all the authority that utter ignorance can yield).
As the name says, "ligne claire" is about lines (Tintin being the archetypal example). The line is "claire" ("clear", yes Sunflower!
) in that it has a uniform thickness (not the case here), and that no 'auxiliary' lines are used (hatchings and the like) to render shadows and/or depth. Details are either completely drawn (with a constant thickness, remember!) or omitted.
Piney's style and "ligne claire" share the flatness impression (no shadows, flat colors) but Piney has a nice distinctive suppleness and suggests details. For instance, looking at Lalli, two very short lines stress the shoulders. I think they suggest seams, am I right? In canonical "ligne claire" we would see a full line of seams - or nothing at all.
Short: this is not "ligne claire", this is Piney - and it's very good!
Please, do not take this rambling as the criticism it is not! *kneels and joins hands* Please, tell me you don't!