Please clean me!

Mr K's mum gave us this picture when she moved house as we have always liked it. It's now hanging on our newly painted living room wall, but unfortunately it has been battered a bit in its life (not by us!) and has two holes in it, as well as being quite dirty. I don't know whether it's possible for me to clean it up myself - I'll have to look into it, but I love it! The dunes remind me of a beach weekend we had in Denmark, camping with Alfred. He enjoyed running free in the dunes so much! We'll do it again some time Alfred! :-)