marciofs, have a look at This is the website of the excellent photographer and darkroom worker, Les McLean. Under articles he has a page on flashing and fogging which has an example of what flashing can do. His example is very similar to your print.

He also has a book called Creative Black and White Photography which I would recommend you buy. Copies are available from Amazon or Allibris Books. The book is very good value and contains a lot of useful information on taking photographs, processing the film and making prints.

Yes it is in English but I think you will be able to read and understand it.