Thanks !
I've dhoot some without the distortion but without the foreground too ! Eventually, the foreground makes the photo, so that's the one I kept.
Once again, holding the camera horizontally is the key and I didn't do it clearly at this time, as I was leaving, frustated that no good photos was there. And as I was leaving the location, looking from the road again, I saw that what I needed was a this nice foregreground. I don't really know if I could have done better with the distortion, by being more focused or if that was it.
So I have no alternative to show