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You can control the position of an image using options for the figure environment, e.g. the [h!] in the example below tells LaTeX to put the figure exactly where it appears in the text, instead of letting it 'float' to a particular place in the document.

  \caption{A picture of a gull.}
  \includegraphics[width=0.5\textwidth]{Image File Name}

For more information, please see the wikibook article: http://en.wikibooks.org/wiki/LaTeX/Floats,_Figures_and_Captions.