\begin{frame}
  \frametitle{Any questions?} \label{frm:que}
  \begin{columns}
    \begin{column}{0.49\textwidth}
      \centering
      \includegraphics[width=0.75\textwidth]{img/qleft}
    \end{column}
    \begin{column}{0.49\textwidth}
      \centering
      \includegraphics[width=0.75\textwidth]{img/qright}
    \end{column}
  \end{columns}

  \centering
  \vspace{-1cm}
  \includegraphics[width=0.20\textwidth]{img/ty}
\end{frame}