LaTeX code for importing, formatting, centring, captioning and labelling an image. Will force images to follow after each other and stay in the same section. Compliments of @cgddrd

image.tex

% Include the required packages.
\usepackage{float}
\usepackage{graphicx}

% insert a single centred image into a LaTeX document.
\begin{figure}[H]
\centering
\includegraphics[width=0.7\textwidth]{<path-to-file>}
\caption{<image-caption>}
\label{fig:<image label>}
\end{figure}