Signed on your picture clearly reads "Locken", ie with "n", rather than with "r" at the end. There was a little-known English artist Locken, about him is only mentioned on the website
http://www.findartinfo.com/search/li...86&name=Locken. And then, without specifying the name and dates of life. On the other known sites with databases of artists anywhere there is no information about the artist with the surname Locken, alas ... But try all the same search.
There was also a Norwegian artist Karl (Kalle) Løchen, but he signed monogram "KL"