% center images
\usepackage[export]{adjustbox}
\LetLtxMacro{\OldIncludegraphics}{\includegraphics}
\renewcommand{\includegraphics}[2][]{
  \begin{center}
    \OldIncludegraphics[max width=8cm,max height=4cm,#1]{#2}
  \end{center}
}

% avoid that figures get a whole page
\renewcommand{\floatpagefraction}{.8}%

% start new page with each section
\usepackage{etoolbox}
\pretocmd{\section}{\clearpage}{}{}