I was never into reportage for newspapers/mags etc (although I used reportage style for children, family groups and weddings) so I have no experience of negotiating, although I believe it is easy to be ripped off if you are not an established professional, or alternatively do not have an agent.
Neither did I do a lot of fashion/portfolio/glamour photography. I had a spell at makeover photography but hated it. My daughter knows more about that industry.
She's a partner in this business
http://jk-photography.net/
Her own sites are
As a digital retoucher :-
http://www.myretoucher.co.uk/myretoucher_services.htm
and as a photographer
http://katharinemillichope.com/
I can identify more with the urban and nature shots you have done, and there are several there which I like, particularly the boating scenes - but as always this is a subjective thing.
Lars, are you doing paid portfolio work ?