I am trying to number each image as (a), (b).......(i), (j) but i am unable to do it. I have inserted the magnified images in a table using the following code:
\begin{figure}[ht]
\centering
\begin{tabular}{c c c c c}
\begin{tikzpicture}[spy using outlines={circle,red,magnification=5,size=1cm, connect spies}]
\node { \includegraphics[width=0.20\textwidth]{gallery} };
\spy on (0.01,0.02) in node [right] at (0.55, 0.68);
\end{tikzpicture}
\begin{tikzpicture}[spy using outlines={circle,red,magnification=5,size=1cm, connect spies}]
\node { \includegraphics[width=0.20\textwidth]{gallery} };
\spy on (0.01,0.02) in node [right] at (0.55, 0.68);
\end{tikzpicture}
\begin{tikzpicture}[spy using outlines={circle,red,magnification=5,size=1cm, connect spies}]
\node { \includegraphics[width=0.20\textwidth]{gallery} };
\spy on (0.01,0.02) in node [right] at (0.55, 0.68);
\end{tikzpicture}
\begin{tikzpicture}[spy using outlines={circle,red,magnification=5,size=1cm, connect spies}]
\node { \includegraphics[width=0.20\textwidth]{gallery} };
\spy on (0.01,0.02) in node [right] at (0.55, 0.68);
\end{tikzpicture}
\begin{tikzpicture}[spy using outlines={circle,red,magnification=5,size=1cm, connect spies}]
\node { \includegraphics[width=0.20\textwidth]{gallery} };
\spy on (0.01,0.02) in node [right] at (0.55, 0.68);
\end{tikzpicture} \\
\begin{tikzpicture}[spy using outlines={circle,red,magnification=5,size=1cm, connect spies}]
\node { \includegraphics[width=0.20\textwidth]{gallery} };
\spy on (0.01,0.02) in node [right] at (0.55, 0.68);
\end{tikzpicture}
\begin{tikzpicture}[spy using outlines={circle,red,magnification=5,size=1cm, connect spies}]
\node { \includegraphics[width=0.20\textwidth]{gallery} };
\spy on (0.01,0.02) in node [right] at (0.55, 0.68);
\end{tikzpicture}
\begin{tikzpicture}[spy using outlines={circle,red,magnification=5,size=1cm, connect spies}]
\node { \includegraphics[width=0.20\textwidth]{gallery} };
\spy on (0.01,0.02) in node [right] at (0.55, 0.68);
\end{tikzpicture}
\begin{tikzpicture}[spy using outlines={circle,red,magnification=5,size=1cm, connect spies}]
\node { \includegraphics[width=0.20\textwidth]{gallery} };
\spy on (0.01,0.02) in node [right] at (0.55, 0.68);
\end{tikzpicture}
\begin{tikzpicture}[spy using outlines={circle,red,magnification=5,size=1cm, connect spies}]
\node { \includegraphics[width=0.20\textwidth]{gallery} };
\spy on (0.01,0.02) in node [right] at (0.55, 0.68);
\end{tikzpicture}
\end{tabular}
\end{figure}
