\usepackage{fontspec}
\usepackage{amsthm}
\usepackage{graphicx}
+\usepackage[percent]{overpic}
\usepackage{minted}
%Options: Sonny, Lenny, Glenn, Conny, Rejne, Bjarne, Bjornstrup
\usepackage[Lenny]{fncychap}
~
\begin{subfigure}[t]{0.30\textwidth}
\centering
- \includegraphics[width=\textwidth]{fig/factory/lena_eye/r_p2_n16_b8000_g60_r5_s3_color.png}
+ \begin{overpic}[width=\textwidth]{fig/factory/lena_eye/r_p2_n16_b8000_g60_r5_s3_color.png}
+ \put(80,0){\includegraphics[scale=0.05]{fig/wheel.png}}
+ \end{overpic}
\caption{%
Anisotropy tensor.
}