I have been working away on this, and it has changed a few times ... whizzing round the colour wheel a bit while I try to remember and find the warm golden light and lavender shadows of Vichy! The lawns were certainly not so lush and green! There are still lots of rough bits... lady's left hand and duster, bags, bike, etc., but I am 'over' it for now. I always wanted it to be 'broad brush', so should not have to tweak detail, but I am SO inconsistent, so the background is more fiddly than it should be, if the faces are not described!
Overall, I have to say I like the jolly nature of the scene, though it is a bit of a caricature.
I like stripes very much, and a grid, and am pleased to have incorporated these.
I THINK I have achieved a bit of a triangular composition, though the apex could be better emphasised (I want it above the red head). And I think the white bits provide a bit of dance and movement.