latex include figure

 Method 1

\usepackage{graphicx}
\usepackage{caption}
\usepackage{subcaption}

\begin{figure}  
 \centering  
 \begin{subfigure}[b]{0.22\textwidth}  
                      \includegraphics[width=\textwidth]{img/fig1/000254.png}  
         \label{fig:left_img}  
 \end{subfigure}  
 \begin{subfigure}[b]{0.22\textwidth}  
         \includegraphics[width=\textwidth]{img/fig1/000254R.png}  
         \label{fig:right_img}  
 \end{subfigure}  
 \begin{subfigure}[b]{0.45\textwidth}  
         \includegraphics[width=\textwidth]{img/fig1/vel2.png}  
         \label{fig:vel}  
 \end{subfigure} 

 Method 2

\begin{figure}

\includegraphics[width=1\columnwidth]{img/img5/scenes.png}
\caption{.}
\label{fig:}
\end{figure}