About point 13, that's not it, Olympe, sorry. (I already had the tool box covered in point 11)
But point 1 is correct;
1]] The roof of the car on the right is a little bit shinier.
So what we have left (with some hints
);
13]] This is a hard one; a [blank] stands in the background, just behind Perry's [blank]. It has grown a little bit.
14]] This one is even harder; [blank] of the [blank] on the far left and top of the picture sticks out to the right. (<-- about that one I feel a little bit guilty because I don't really think that you could see it
)