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Keep in mind that professional just means the person is getting paid, doesn't mean they are any good or not. I look at most of the home listings around here and someone was certainly being paid to take the shots, but the majority of them are quite awful.
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you're absolutely right--mostly. to wit: we do have a number of professional politicians and most, if not all, seem quite awful at doing their job. yet their income from this profession of theirs, usually far exceeds ours.
but the term "professional" actually has a number of nuanced meanings that depend on the context. in the example you give, the photos are most likely being taken by a professional realtor that has experienced that any snapshot will help him/her make his/her paid job of selling the house more effective than no photo at all. or perhaps by a professional assistant to the real estate office whose paid job it is to do perform various duties to help the sales force.
my use of the word was in reply to the second response that used terms like "high end" and "absolute best". i used a definition of professional which the dictionary lists as: "a person who is an expert at his or her work"
but, "antics with semantics" aside, i would not recommend anyone take my inexact use of the language too seriously, because english is not my native tongue, i learned it late and only as a fourth language.
on a more practical matter regarding the OP's concern, I am reposting a link that I found last night. It has strong ties to the FOG, so most of you have seen it already, but it does illustrate beautifully how a simple portfolio that is not professionally shot can have a tremendous positive impact for a quality craftsman in the trades.
http://www.thisiscarpentry.com/2009/10/01/making-money-built-ins/
and peter: great job with the photo correction.