![alt text][1]
\documentclass[border=5pt, varwidth]{standalone}
%\documentclass[]{article}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage[T1]{fontenc}
\usepackage{amsmath,amsfonts,amssymb, relsize}
\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{patterns}
\usepackage{mwe}
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}[scale=1]
\def\BildI{\includegraphics[scale=0.1]{example-image-a}}
\def\BildII{\includegraphics[scale=0.1]{example-image-b}}
\def\BildIII{\includegraphics[scale=0.1]{example-image-c}}
\begin{axis}[
xtick={1,2,3},
xticklabels={\BildI, \BildII, \BildIII}
%xtick={\includegraphics{Bild1},\includegraphics{Bild2},\includegraphics{Bild3}}
]
\addplot[pattern = north west lines,ybar,pattern color=blue]
coordinates {(1,4.6)};
\addplot[pattern = north west lines,ybar,pattern color=blue]
coordinates {(2,4.8)};
\addplot[pattern = north west lines,ybar,pattern color=blue]
coordinates {(3,7.6)};
\end{axis}
\end{tikzpicture}
\end{figure}
\end{document}
[1]: http://texwelt.de/wissen/upfiles/55555555_36.png
