How to find right image/picture to illustrate your ideas : Choose synonyms or contextual ideas, then type these key-words inside the search engine. Jackpot!!!
1. Use metacrawler finding pictures on many sites using tags (names describing the picture)
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http://www.cyclo.ps/ [*]
http://www.epictura.com2. Or go directly to Microstock agencies that give away tons of free photos (or 1 dollar fee pictures)
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http://www.shutterstock.com/[*]
http://www.fotosearch.com/[*]
http://www.pictobank.com/[*]
http://www.photononstop.com/ [*]
http://www.bigstockphoto.com/[*]
http://www.canstockphoto.com/[*]
http://www.dreamstime.com/[*]
http://www.fotolia.com/[*]
http://www.istockphoto.com[*]
http://www.panthermedia.net/[*]
http://www.shutterstock.com/[*]
http://www.stockxpert.com/3. Or more expensive
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http://pro.corbis.com/[*]
http://www.gettyimages.com/ [*]
http://www.masterfile.com/