Thank you all for your help and comments. Of course there are some more pictures.
10) A totally damaged Bomber (DO ?), probably on the coast in northern France or in the Netherlands, my grandfather is standing on the wreck:
11) Another view of the wrecked plane. It looks like a biplane to me. Does someone have an idea what it could be ?
12) This looks like a test run to me, the plane could be the same as in 7):
