I want to insert a picture into a TikZ graphic, is it possible?
An example:

I want to insert a picture into a TikZ graphic, is it possible?
An example:

it works better with: \node at (0,0) {\includegraphics[width=2cm]{your picture}};

You can do it with pgfplots. Here is an example:
\documentclass{article}
\usepackage{pgfplots,siunitx}
\pgfplotsset{width=7cm,compat=1.10}
\begin{document}
\begin{tikzpicture}
\begin{axis}[enlargelimits=false,axis on top,xlabel = Displacement
(\si{\milli\meter}), ylabel = Load (\si{\kilo\newton})]
\addplot graphics
[xmin=0,xmax=8,ymin=0,ymax=90]
{example-image-a};
\end{axis}
\end{tikzpicture}
\end{document}

\node at (0,0) {\includegraphics[width=2cm]{your picture}};Change postion(0,0)andwidth. You can also do it withpgfplots. – Aug 11 '14 at 00:34\documentclass{...}and ending with\end{document}. – cfr Aug 11 '14 at 00:43